I checked last night, and lo and behold, I had 2.07. I still encountered audio blips (though very few), momentary frozen video and a/v sync issues. However, and this was new to my 522, it behaved differently when a/v sync was lost. When I lost sync, I would briefly rewind (not the 10 sec skip back, but rewind) and sync would be regained. I know this was always the solution to the bug, but there was a difference under 2.07. When I hit the rewind button, the video would rewind like I expected, but when I resumed playback, the video returned TO THE POINT THAT I HAD PRESSED REWIND AT and resumed playback with proper sync. So, although I still had to rewind to gain sync, I didn't have to repeatedly watch several seconds that I had already seen.
Not sure if this is a workaround, still a bug, or the official solution, but it was less annoying to live with than before!