Setting the resolution in CS:GO to your display resolution should fix it, if such a setting exists. I used to have this playing WoW fullscreen, basically what happens is when the game is launched it temporarily changes your desktop resolution to match that of the game, then when the game is minimised your resolution is restored. It's kinda naughty behaviour implemented by software developers, but it's a simple solution to a rather complex problem.
You cannot fail, so I'm lowering the standard.
Run CS in fullscreen windows or just windowed. problem solved![]()
Options > Graphics > Advanced > OpenGL
Tibia > Minimized.
Works for me, doesn't debug Tibia either when you start Csgo.