Since we aren't seeing widespread reports at the moment, I suspect that it's an issue with your local files or some account setting possibly.
The suggestions you're seeing in other threads are probably still relevant. Start by verifying your game files on Steam. Reboot your computer. Reboot it again just to be sure. Check video card drivers. Check memory isn't overflowing. Check you can log into the forums with a private browser or a different browser because it goes off the same auth system.