After uninstalling EZdok 3 my Track Ir 5 did not start and work with FSX SE. Then I tried this advice

https://steamcommunity.com/app/314160/discussions/0/537402115091410952/

After that Track Ir worked but I got problems with FSUIPC in that FSXSE giving a message that Flight Simulator has detected a problem with 3 party software FSUIPC.dll and if I choose to run it FSXSE crashes.

I have tried reinstalling FSUIPC and repairing and installing simconnect again but nothing helps

Have you tried verifying your game cache?

 Verify your game files.   Open the Steam Client;  right click your game in the Games Library and select Properties;  select Local Files tab and click on Verify Integrity of Game Cache.   If there are any missing or corrupted files, this should correct it for you.

23 hours ago, charliearon said:

Have you tried verifying your game cache?

 Verify your game files.   Open the Steam Client;  right click your game in the Games Library and select Properties;  select Local Files tab and click on Verify Integrity of Game Cache.   If there are any missing or corrupted files, this should correct it for you.

That solved the issue. I was told that more than 5000 files failed to validate. A mystery for me how so many files could have been messed up.

On 8/11/2020 at 11:09 PM, charliearon said:

Have you tried verifying your game cache?

 Verify your game files.   Open the Steam Client;  right click your game in the Games Library and select Properties;  select Local Files tab and click on Verify Integrity of Game Cache.   If there are any missing or corrupted files, this should correct it for you.

Well the problem has popped up again and this time your suggestion didn't help although 28 files were not validated. It happened once before but a restart solved that time. Today I have upgraded my videocard and the NVIDIA drivers