I wondered the same thing when we started with a new therapist. I thought, well, we talked about this a little bit with the old T and it didn't help very much so why bother, right? Why bring up all that s&*t up again? And besides, it would just stress us out and be all scary and we'd have those dumb flashbacks.
But then we did bring it up with our new T, and she has a TOTALLY different (and much more helpful) approach to working with these issues than old T did. And we are making so much more progress, in a much faster time frame, than we did with old T. So telling and talking about it again was a good idea. I think its absolutely critical that you bring it up again with the new T. They may have different ideas, or be more helpful, or just new thoughts or something. You never know.