It sounds like you have two seperate problems here - the first is due to hibernate - you haven't what your setup is - EEJB3? The hibernate jars were probably updated between Seam versions.
The second is because you have two Seam components with the same name. Seam used to just (randomly I think) choose one, now it errors. Fix this (look at the component before the error message to find which one is the problem) and the second error should go away.
Thanks, you were right I did have two components with the same name