Sounds like a personal problem.
I recently upgraded my wordpress framework to 2.8 and found that I could not add / edit my sidebar widgets. I really wanted to add some northpointonline.tv love to the side and couldn’t do it!
I discovered I needed to upgrade my version of thesis to 1.5.1. Took more time to get the upgrade than to actually perform the upgrade.
I did have to upgrade my intensedebate plugin too. All is good now.