Fix an FSX menu that freezes or says Not Responding by checking hidden prompts, UIAutomationCore, add-on modules, config files and permissions.
An FSX menu usually freezes because a hidden dialogue is waiting, a legacy UIAutomationCore conflict occurs, or a third-party DLL, gauge or utility has stalled the simulator. First identify whether the lock-up happens at startup, only inside a flight, or only with one aircraft; that distinction determines the fix.
What causes the FSX menu to stop responding?
The point at which Microsoft Flight Simulator X freezes is the strongest clue to its cause. Windows showing Not Responding only means FSX is not processing window messages; it does not identify the component responsible.
| When FSX freezes | Likely cause | Best first test |
|---|---|---|
| Before the opening menu becomes usable | Hidden prompt, inaccessible scenery path, security software or a failing startup module | Check other windows, then test without third-party startup modules |
| When opening the in-flight menu repeatedly | Legacy UIAutomationCore conflict | Test the dedicated local-DLL remedy |
| Only with one aircraft or panel | Faulty gauge, panel file or aircraft-specific module | Repeat the flight with a stock aircraft |
| When opening the Add-ons menu | Malformed dll.xml, an incompatible module or SDK utility | Temporarily disable the relevant module entry |
| Only in full-screen mode | Overlay, graphics injector or display-mode conflict | Run FSX in windowed mode with overlays disabled |
If the simulator stalls before you can use the opening screen, follow our checks for prompts, add-ons and paths that block FSX startup. A long scenery or weather operation can make FSX appear unresponsive temporarily, so check for disk activity before ending the process.
How do I fix a frozen FSX menu?
Work through the tests in order and change one thing at a time. Keep backups of every file you rename so that a failed test can be reversed.
- Look for a hidden dialogue. Use
Alt+Taband inspect the taskbar for an FSX, add-on or Windows security prompt behind the simulator. A modal dialogue prevents the main FSX window from responding until it is answered. - Test windowed mode. Start FSX in a window, or use
Alt+Enterbefore reproducing the problem. If the menu works there, disable recording overlays, graphics injectors and other programs that hook into the FSX display. - Load a clean flight. Choose a stock aircraft, simple weather and default scenery. If that works, the menu itself is not generally broken; the selected aircraft, gauge, scenery or saved flight is loading the faulty component.
- Disable third-party startup modules. In the FSX or FSX-SE application-data configuration folder, rename
dll.xmlandexe.xmlindividually to backup names, then restart FSX. Either file may legitimately be absent. If the freeze disappears, restore the files and disable their add-on entries one at a time. - Rebuild the main configuration. Close FSX and rename
fsx.cfgin the same configuration folder. FSX creates a fresh copy at the next launch. This resets graphics and performance settings, so preserve the original rather than deleting it. - Apply the UIAutomationCore fix only when the symptoms match. This issue usually appears while using the in-flight menu on modern Windows, often after the menu has been opened several times. Follow our FSX UIAutomationCore diagnosis and safe local-DLL procedure. Never replace the copy in the Windows system folders or install a random DLL from an unverified package.
- Repair permissions or original files. Check whether security software has blocked FSX from reading or writing its configuration folders. Steam Edition users can verify the installation files; boxed FSX users can run the repair option from their original media. Back up modified default files first.
What if only one FSX menu item freezes?
A single frozen command usually points to the data or module loaded by that command, rather than a general Windows compatibility problem.
- Aircraft selection: move the most recently installed aircraft out of
SimObjects\Airplanestemporarily and retest. A malformed configuration, panel or gauge can lock the selector or the subsequent flight load; our aircraft-specific freeze checks cover that fault in more detail. - Scenery Library: reconnect any drive containing active scenery and check the most recently added scenery area. FSX can stall while trying to inspect a missing or inaccessible path.
- Flight Planner: test a newly created plan and temporarily move the suspect saved
.PLNfile out of the Flight Simulator X Files folder. - Pilot Records or Logbook: back up and rename
Logbook.BINin the Flight Simulator X Files folder. FSX will create a new logbook, confirming whether the original was damaged. - Add-ons or an SDK tool: inspect the associated
dll.xmlentry and required components. If the problem began after adding the Object Placement Tool, use these Steam Edition SDK, SimConnect and DLL configuration checks.
Should I reinstall FSX when the menu keeps freezing?
Reinstall FSX only after a clean configuration and disabled add-ons have failed. A normal uninstall often leaves the user configuration, saved files and third-party modules behind, so reinstalling can reproduce the same freeze immediately.
If a fresh fsx.cfg fixes the menu, copy settings back manually rather than restoring the entire damaged file. If disabling dll.xml or exe.xml fixes it, reinstall or remove the identified add-on instead of replacing the whole simulator.