Actually, the first two crowd crashes happened when using the OnRez-LL Viewer combo that you suggested. (The nice thing about it was that I was less likely to get mixed up since the interfaces were slightly different.) The photo session was done with two iterations of the Release Candidate viewer, and there were no problems there.

Have you and your companion been able to visit crowded areas? I always got the impression that your time with him was largely in private, which might explain why you've had fewer problems.