actually this isn't a suggestion but i absolutely had no clue where to post this.
Here is what i experience: (and sorry for formatting ... that's the bug, i can't do it otherwise).
Everytime i write a post on the MMO-Champion Forums i encounter that bug.
sometimes i want to go to the next line in the text by pressing the "Enter" key and then the textbox screws up (the cursor disappears from the box).
when i press enter again the site crashes and i receive the following error message from my browser:
(this is a translation since my Chrome browers is german) "Oh no! When displaying that website an error occured. Refresh the site or go to another one."
Yeah, it's an issue with the third-party editor in vBulletin. We know there are a ton of issues, and we recommend sticking with the standard or basic editor (not the WYSIWYG one), but unfortunately there's not much we can do for now.
Something we've noticed is that if you see the cursor disappear, drag the box at the bottom right hand corner bigger, and you should get your cursor back and everything should be fine (for a while).
We're waiting on a real fix from vBulletin/CKEdit, so hopefully that will come soon.