Killing floor bug

I have owned killing floor for around half a year and recently started playing again.

Something very odd happens when i launch killing floor, the game seems to crash unless i minimize or maximize something over killing floor when launching it. This has only been happening for the past few days, its not really a problem considering i can still play i am more just curious.

I have tested this theory many times and i am now %100 certain the game will crash if i do not minimize killingfloor or maximize something over killing floor while it is launching.

DEFUQ IS HAPPENING?

It looks like grapical problem. Is there any crash report from killing floor? If yes give it to us. Other thing you can do is to check integration from Steam menu or just delete killingfloor.ini and user.ini from System folder in KF. In most cases this helps when somethings wrong.