I tried to tell you I was surprised that a reinstall would make a difference. I also gave you some things to try to workaround the problem. You need to try to work around it until a developer reproduces it and fixes it. You can try the different options in Settings > Display Method to see if it makes a difference:
Also, do not try to work in HD on a system with only 4 GB RAM (mentioned on facebook) as specified in the FAQ.