Why don't you try to contact Steam Support?
Try this not sure if it will work
1. Open your Steam library
2. Search for CS:GO and right click on it
3. Select properties
4. Here select "Launch options"
5. and type in "-autoconfig"
6. Launch and try !
If it doesnt work try to check your graphic card for updates or run a malware/virus scanner
I tried that already! I said that in the post....
Not you, wriken, I will try that now.