I already wrote about this a while ago, but everytime I change a block's name, when I try to enter it, the screen goes blank. I have to refresh or go back, and I get sent back to the main course page. It's pretty annoying.
Lately, I also get this bug where I can't edit text (as in, select a word and make it bold). I have to hit F5 and then I can edit it. It happens quite often.