
While Microsoft Flight Simulator X (FSX) can be a seamless experience for many users, others face numerous errors, incompatibilities, bugs, and performance issues. One common problem is the Fatal Error Occurred issue, which halts the simulator and closes it. This error can be caused by various factors, ranging from obvious and easy-to-solve problems to complex issues within the FSX code. In some cases, it may be related to the Compatibility mode of the program, especially when running older copies of FSX on newer Windows operating systems. Users experiencing this issue can try changing the compatibility mode to Windows XP to see if that resolves the problem.
| Characteristics | Values |
|---|---|
| Cause of Error | Numerous errors, incompatibilities, bugs, and problems |
| Result of Error | Simulator closes back to the desktop, losing all progress |
| Solutions | Changing compatibility mode, checking for updates, reinstalling, checking support forums |
| Complexity of Fixing | Requires detective work, trial and error, and luck |
| Impact on Playability | Can halt the simulator and require a fresh start |
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What You'll Learn

Errors caused by bugs and incompatibilities
Errors in Microsoft Flight Simulator X (FSX) can be caused by bugs and incompatibilities. These issues can significantly impact the performance and playability of the simulator, causing frustration among users. While some errors may be due to obvious and easy-to-solve problems, most are buried within the complex code of FSX, making it challenging for users to identify and fix them.
One common issue is the "Fatal error occurred" problem, which abruptly halts the simulator and closes it, causing players to lose their in-flight progress. This error can be caused by various factors, and resolving it often requires detective work, trial and error, and sometimes even luck. Users experiencing this error are advised to explore solutions shared on support forums or modify the compatibility mode of their program.
FSX users have reported various bugs and glitches that impact their experience. For example, one user mentioned an issue with the landing lights not functioning correctly when viewed from a distance. Another user encountered a problem with exclusion polys in the Airport Design Editor, resulting in a building intruding on their airport design.
In addition to bugs, incompatibilities between older copies of FSX and newer Windows operating systems can also cause issues. Users have suggested right-clicking on the FSX shortcut and changing the compatibility mode to Windows XP to address this.
To address these issues, developers are encouraged to work closely with the flight simulation community to identify and fix bugs and glitches. Users can provide reproduction steps or detailed descriptions of the issues they encounter to help developers build a more stable simulator.
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Errors due to complex coding
While using Microsoft Flight Simulator X (FSX), users may encounter a "Fatal Error" that abruptly halts the simulation and closes the program. This issue is often caused by a multitude of factors, including errors, incompatibilities, bugs, and complex coding.
The complex coded constructs of FSX can sometimes lead to "crossed wires," resulting in errors that are challenging to decipher and resolve. These errors are typically embedded within the files and are not related to multiplayer servers. The large and intricate codebase of FSX makes it difficult for users to identify and fix the issues.
In some cases, the "Fatal Error" may be triggered by changing the Compatibility mode of the program. This issue is more likely to occur with older copies of FSX running on newer Windows operating systems. Users can try changing the compatibility mode to Windows XP to see if that resolves the problem.
Additionally, some errors may be caused by issues with the Airport Design Editor (ADE) and the associated compilers. For example, the failure of BGLComp to factor in the new 'multiple XML code element' requirements of FSX and P3D when Fuel Services are added can lead to an APPCRASH. This is considered an error of omission in the coding of SDK BGLComp.xsd and BGLCOMP.exe by ACES in MS-FSX.
Furthermore, add-on developers for FSX may employ workarounds to navigate limitations, which can result in incorrect displays and information for add-on airports. Examples of these discrepancies include airports without runways, duplicate airports, and taxiways in water. These workarounds are implemented to ensure proper AI behaviour but can introduce inconsistencies and errors.
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Errors at startup
For users of Microsoft Flight Simulator X (FSX), a common issue is encountering a "Fatal Error" message at startup. This error can be incredibly frustrating as it abruptly halts the simulator and forces it to close, causing any unsaved progress to be lost. While the specific causes can vary, there are several troubleshooting steps that users can take to address this issue.
One potential cause of the "Fatal Error" is the Compatibility Mode of the program. This issue is more likely to occur with older copies of FSX running on newer Windows operating systems. To address this, users can try changing the compatibility mode to Windows XP. Right-click on the FSX shortcut, select Properties, go to the Compatibility tab, and change the compatibility mode to Windows XP.
Another possible cause of the error is corrupted files within FSX's file system. To address this, users can try performing a clean uninstall of FSX using a program like 'Revo Uninstaller' to ensure that all remnants of the program are removed. Then, reinstall FSX and see if the issue persists. Additionally, users can check for specific error codes and their potential solutions. For example, ERROR CODE 8-c0000006 indicates an issue with the game accessing necessary files or potential hard drive issues. In this case, it is recommended to run a disk check to ensure the hard drive is healthy.
In some cases, the "Fatal Error" may be related to specific airport scenery or add-ons. For instance, issues have been reported with the EGLL airport in London due to its proximity to other busy airports and highly detailed scenery areas. To troubleshoot this, users can try disabling add-ons, reducing scenery settings, and turning off AI traffic, especially when dealing with complex airports.
It is worth noting that the "Fatal Error" in FSX can have various causes, and finding the exact solution may require some trial and error. If users encounter specific error codes, it is recommended to search for those codes in forums or seek assistance from the FSX support community, as others may have encountered similar issues and found solutions.
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Errors caused by outdated software
While Microsoft Flight Simulator X (FSX) can be a seamless experience for many, with smooth running and spectacular performance, others have encountered numerous errors, incompatibilities, bugs and problems that have caused performance to suffer or have even rendered FSX unplayable. One common issue is the "Fatal error occurred" problem, which halts the simulator and closes it.
This error can be caused by a variety of factors, some of which are relatively easy to solve. One solution is to ensure that you are using a strong enough machine to run the software. Over time, your machine's power supply, fan, and graphics card can become dusty, impacting performance and causing overheating, which can lead to errors. Cleaning the interior of your PC can help mitigate this issue.
Additionally, the "Fatal error occurred" issue may be related to the compatibility mode of the program. If you are using older copies of FSX on newer Windows operating systems, you may need to change the compatibility mode. Right-click on the shortcut for FSX and change the compatibility mode to Windows XP. This solution may not always work, but it is worth trying for those experiencing startup issues.
Another tool that can help is a software tool created by Jesus Altuve. This tool analyses your current FSX settings, compares them to optimal settings, and suggests changes. Implementing these changes has proven to be a useful solution for many users. It is recommended to make a copy of your current fsx.cfg file before making any changes.
In some cases, the "Fatal error occurred" issue may be due to an incomplete installation of the application. To resolve this, you can try reinstalling FSX or using the Software Licensing System Reset Tool. Additionally, ensuring that you have both Service Pack 1 and Service Pack 2 for Flight Simulator X may help resolve the issue.
While finding the exact cause of the "Fatal error occurred" issue can be challenging, the solutions mentioned above provide a good starting point for troubleshooting.
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Errors caused by incomplete installation
One common issue is the "Fatal error occurred" problem, which can be caused by various factors, including incomplete installation. When encountering this error, it is recommended to right-click on the FSX executable icon, select Properties, and ensure that the "Run this program in compatibility mode for" option is checked. Selecting Windows XP compatibility mode may resolve the issue, particularly for older copies of FSX running on newer Windows operating systems.
If the problem persists, ensure you have both Service Pack 1 and Service Pack 2 for Flight Simulator X installed. If you have the Flight Simulator Expansion Pack, these service packs are already included. In some cases, you may need to repair or reinstall FSX. However, issues with the uninstallation process have also been reported, requiring the use of tools like Revo Uninstaller and Regscanner to remove leftover registry entries.
Additionally, errors can occur during the compilation of airport changes in Airport Design Editor (ADE). For example, a user reported an issue where ADE generated a warning related to an XML file path. Resolving this issue involved uninstalling ADE, cleaning up the registry, and reinstalling ADE to the default location. Updating ADE to the latest version and making changes to the airport gate settings may also be necessary to address compile errors.
While some errors may have straightforward solutions, others may require significant troubleshooting and detective work. It is always recommended to back up your data before attempting any fixes, as incorrect modifications could lead to data loss or further complications.
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Frequently asked questions
This could be due to an incomplete installation of the application. Try right-clicking on the FSX executable icon, then clicking Properties. On the Compatibility tab, check "Run this program in compatibility mode for" and select Windows XP.
The fatal error in FSX could be caused by a variety of issues, ranging from obvious and easy-to-solve problems to complex code issues. In some cases, it may be due to compatibility issues with older copies of FSX running on newer Windows operating systems.
Unfortunately, there may not be an easy solution. It often requires a fair bit of detective work, trial and error, and sometimes even luck. You can try looking for solutions on support forums or by deciphering the error code.
A fatal error will typically stop the simulator and close it back to the desktop, causing you to lose your progress and start again from scratch.
















