I’m having a similar issue. Everything worked fine until I upgraded WordPress and Buddypress day before yesterday to:
Now whenever someone posts text the whole page is displayed in the text box for a couple of seconds and then the page makes like it’s going to save, but hangs white. If you stop or refresh the page whilst it’s hanging this is displayed infront of the url http://wyciwyg://62/
I’m using the custom community theme, but have tried using the default them and it still does it. The only person that doesn’t have this problem is me when I’m logged in as admin. All other user levels have this problem though.
I did add bbpress forum after upgrading and have tried deactivating that, but that didn’t fix it. Posting in the forum works fine though.