I have tracked down a recording playback problem (very choppy, hanging video) to the mythtv upgrades.
The following packages were upgraded:
libmyth-0.22-0 (0.22.0-fixes23565-0ubuntu0 => 0.22.0-fixes23710-0ubuntu0)
mythtv-backend (0.22.0-fixes23565-0ubuntu0 => 0.22.0-fixes23710-0ubuntu0)
mythtv-common (0.22.0-fixes23565-0ubuntu0 => 0.22.0-fixes23710-0ubuntu0)
mythtv-database (0.22.0-fixes23565-0ubuntu0 => 0.22.0-fixes23710-0ubuntu0)
mythtv-frontend (0.22.0-fixes23565-0ubuntu0 => 0.22.0-fixes23710-0ubuntu0)
mythtv-transcode-utils (0.22.0-fixes23565-0ubuntu0 => 0.22.0-fixes23710-0ubuntu0)
After these packages were upgraded, and a show was recorded, I could not play the video. Once the packages were removed, I still could not watch the recordings, but new recordings play fine. Any ideas?