This will take time.
The fix Michael did add to the build and did work on the only customer that had reported this so far. As more systems are being transitioned to this php version 4.3.1. RC10 we are seeing a couple more of you reporting problems with phpbb integration it looks like.
There is no fix at this time yet as we are still looking into it. With it being a holiday weekend it may take some time to post a fix.