Hmmm, interesting, I'm on Hostrocket and have been since the first of the year running two UBB's on two separate host accounts there. They haven't said anything to me. In fact, I had to have them move my accounts to a different server just for UBB (and yes, I told them it was UBB and they knew what the problem was causing them to switch me to a different host computer).
Is this something new, they haven't said anything to me?