I've just restored my system (using ghost partition images) to a time before installing Plan-G, so I was able to make a test.

After installing Plan-G, I started the application with "Run as administrator", closed it, rebooted my computer, started the application with "Run as administrator", and then built the database without any problems.

I do not know whether the reboot was the solution or the fact that I ran the application as administrator (remember, I have UAC disabled).
Anyway, I did both and it worked flawlessly this time.

I hope this information is helpful to others who want to avoid this small inconvenience.

Thank you for replying!

Hello!

I've just installed Plan-G 3.1.3.113, on Windows 7 x64, with UAC disabled, on the same machine as the simulator (Prepar3d v3.1), no network sharing.

While trying to create the database from the Prepar3d v3.1 scenery, it gets stuck at "Preparing database for new data". I followed the steps mentioned in other similar threads on this forum, and found out from the Plan-G log that PlanG3_P3D.sdf file cannot be accessed because it is opened by another process.

Well, I checked with Process Explorer, and the only open handle I found for this file was owned by Plan-G. I managed to create the database by restarting Plan-G. But I am curious about whether this can be avoided.

Thanks in advance for any suggestions!