FC17 KDE? problems after 'yum update'

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http://forums.fedoraforum.org – After a routine 'yum update' early last week my FC17 desktop has been having freezing problems. It shows up most obviously with thunderbird and firefox. Both hang almost immediately after starting them. I can hang the whole interface occasionally. I haven't done anything unusual to my system and can't seem to find others having the same problem. Everything is currently up-to-date as of today with 'yum update'. I don't know which update the problems followed because I updated repeatedly in hopes that the problem would be resolved with an update. (I can hang Thunderbird immediately and reproduc (HowTos)