Greetings,
OK, I did tried to change the installation folders and indeed the issue was with the Documents folder (where it says "Data Folder" in instalation setup).
So I've chosen another folder in Documents, like G:\Documents\EFB2\ instead of G:\Documents\AivlaSoft\EFB2\, and the problems persisted, however then I changed the data folder to be outside My Documents and now it enters the program's window.
Really strange, do you have any advice for things that I should search to see what might be wrong with my documents folder?
thank you