I had that problem on stock 2.1. I would get a text and 95% of the time it would say it was from the wrong sender. I have found this problem gone in eb01. Did you wipe data and clear cache before flashing? I have not seen this issue in eb01 threads.
I did wipe data/cache on this update. I was able to restore my contacts from an earlier backup (thank you Google). I then did a factory reset and re-synced my contacts. So far, so good.