Display problem with SOPC Builder

Thank you so much BadOmen! Changing the number/currency/date/time format to English (US) from Turkish fixed the problem for me. I didn't need to change any other regional settings. Everything is working like a charm now.

Just for information, there aren't any spaces, special characters or characters specific to Turkish in the path name. Reducing video hardware acceleration wasn't of any help, as I stated in my original post.

I've always used my computers with all settings on Turkish, and although I've used a variety of programs before, I've never encountered one which has issues with number format preferences - until I met SOPC Builder. Interesting, as all other parts of Quartus work just fine with Turkish settings. Anyways, the problem is solved now, thanks again BadOmen.