Could not readily get it lock up IE in either of those links.
But after about 5 pastes it locked up in the page we orignally referenced.
http://cutesoft.net/example/Multiple.aspx
Office 2007 IE7
CS 6.4 tried with beta javascript file same result.
Note, we have another issue in the forums on Autosizing not working when multiple editors are present.
It seems both of these problems involve the presence of multiple editors on the page.
http://cutesoft.net/forums/thread/55632.aspx