jdMorgan - 2:21 am on Apr 30, 2010 (gmt 0)
As with all browser-upgrade problems, it's often a good idea to uninstall the old version and then install the new. Unless you select a checkbox to remove all personalizations (history, bookmarks, passwords, filters, settings, etc.) as well, most browsers will preserve them.
In fact, that can also be a problem if one of the personalization files has been corrupted. The solution if this happens is to either install to a different browser 'user' or to go find the personalization files, and then either back them up and delete the originals, or move them to some place safe. Then do a totally-clean install, make back-ups of the new/clean personalization files as well, and then copy your previous personalization files back one-by-one, watching at each step to be sure trouble does not re-appear.
Interrupted installs can have very weird results, indeed...