Okay, I've watched a few more HD DVDs and some DVDs since my last post on this thread. I haven't had any more shutdowns (with or without turning my HDMI receiver on first), so that's good. However, now I've noticed that I am getting strange sync problems with the XA2. We were watching Phantom of the Opera HD DVD and noticed that the sync seemed to go in and out. Also, Simon and Garfunkel Central Park DVD seemed out-of-sync slightly. These were slight sync errors fixable with about 50ms of correction on my new Sony STR-DG2100 1.3a receiver. However, because it would go in and out of sync on the XA2 for the POTO HD DVD, I am worried it can't be totally fixed using this method, at least for certain HD DVDs.
One other thing I noticed, when using 1080p 24hz on the XA2 and sending it via HDMI thru the DG2100 to my Epson HC1080 projector, even DVDs seem to show up as 23.97hz on the projector (when I don't think they should). My PS3 doesn't pass DVDs as 23.97hz on the projector (even in forced 24hz mode). Only Blu ray films show up as 23.97hz, everything else is the proper 59.97hz. Maybe this has to do with the Reon chip processing everything on the XA2 to 1080p24; but this sometime results in brief combing artifacts at the beginning of takes. Oh well, guess I can use 1080i to get away from these probs (though I don't think I should have to)