At first, FSX was closed completely, I deleted the folder C:\ProgramData\Virtuali\Couatl using the Win7 Explorer.
If you really did what you say here, it's normal it wouldn't work because, I haven't said to JUST delete it.
I've said to delete it AND recreate it! The recreate it part was the most important. If you just delete it and hope GSX would be able to create it itself, it won't obviously work because, as I've said, what is causing the problem is not a "bug" with GSX, but the fact that Windows is blocking write access to that folder because of permissions. But if you create that folder yourself, your user account and all programs you run under that account should be able to write too.
After this I started FSX. After starting flight in the 3D-Window was shown a red colord textline: "Regenerating airport cache (X %), please wait..." the X % were increasing to 49 % and then GSX had stopped any function.
No, it's not. Nothing has "stopped". That sign stays there for a finite amount of seconds, then it goes away. It will not stay until it reaches 100%, the program was still working.
So, I'll repeat it again:
Try to remove that folder:
C:/ProgramData/Virtuali/Couatl
then create it againLet me say: I am the administrator of my own system. I ve tried both: Strting FSX normally or as administrator especially. No solution until this time. All this has happend since the last update of January 7th...
That's not how Windows 7 security works. Even if you "are" the Administrator of your system, when you don't run programs "As Administrator", you are still running as a regular user. Which is why I've told you to RECREATE that folder, as regular user.