Installed this the other day. Messed with my MSN, everytime I pressed return I would have to reclick the cursor inside the box to type. Highly irritating. Uninstalled Saf 4 and it worked again.
Like the coverflow favourites, its just a shame Im embarrassed of most of mine...
I can't believe any uses the horrendous MSN for Mac. Do yourself a favour and download Adium. You'll never look back.