Charachter input limit? Other Limit?

I'm getting this message occasionally in FF 3.6.13 and Safari Version 5.0.2 (5533.18.5). I assume this isn't a browser issue or text inputted issue as it is different text. When I click the view source button it becomes unselectable and this error message appears

too much recursion
[Break On This Error] return;}if(E=='br'){v.push(H);return;}...n=='br'),q=!!o.$empty[l];r.isEmpty=q;
ckeditor.js (line 27)


If I attempt to proceed the next page does not get any content from the editor. Does anyone have any ideas about this or seen this before? Thanks.

-Chris