I loose my cursor

Often times, in Firefox, 1.5.0.9, when I EDIT a published comment, after pressing "enable WYSIWYG" the content of the comment does not show up, I cannot put my cursor in the widgEditor and I get an error right then, "event has no properties". It's rare then that content ever shows up (eventually). I usually have to start again : go to another page and come back.

This happens with the simplest of content : one word in it : <p>hi</p>