If I leave the Xbox in an extender session for a long period of time, it sometimes will sit and spin the progress ring/orb and never play a recording. I have to exit out and go back in.
Before (this SEEMS to be fixed now), when Time Warner sent out their stupid emergency tests (around 3am, when I sometimes was up and WANTED to watch TV), it would take over, change to a black channel and not let me change it after that.
If there's the slightest hiccup (obviously not WMC's fault entirely) it tells you about it EVERY time it happens with no ability to dismiss all the modal dialogs. Example: Sometimes it thinks it can't record something, but it actually is but I get to dismiss all 3-4 dialogs there of it warning me. Same with errors like not subscribing to a channel, etc.
WMC isn't smart enough to care that a show is live and prompt you to extend the timing like my TiVo did. I got bit by this when recording some sporting events. I've since changed my ways, but getting back into the recording details for a show takes a lot of steps.