I'm hoping someone can help me with this. I downloaded and installed the latest operating system today (4.5.0.81 from T-Mobile). Everything is working except for my Yahoo IM...it just says connecting, but never does. I thought I had read something about this happening to someone else, but now I can't find the post.
Have you tried doing a battery pull..
If that doesnt work then you can try and read the link in my sig, yahoo 2.0 with att.. maybe that might give you a little insight