After initially getting the registration error, I was able to re-enroll this morning, rebooted, rescanned, ran setup, and DLNA is enabled. WMC and QuickTV still work fine using the regular tuners. However, I get varying degrees of heavy pixelation and stuttering using XBMC, VLC, and Win Media Player on all my PC's using DLNA, especially on HD channels.
Is there anything I can do to improve the performance? Would there be any benefit to re-installing the firmware since my initial installation was done before I was enrolled?