I am also having this issue of not being able to record from the app and getting the message 'Error creating record for <SHOW TITLE>'
Event viewer is not registering any error for these record attempts. It does show a log (without errors) when I first launch the app and it connects the PC and Media Center but any time I try to set a recording after that nothing new shows in the Event Log.
Attached is my mcc_addin_debug.txt
The relevant parts seem to be just the bit at the very end:
2/1/2012 10:25:44 PM: schedule error: NotFound
2/1/2012 10:29:15 PM: searchProgramSchedules error: System.NullReferenceException: Object reference not set to an instance of an object.
at MCC_MC_AddIn.Application.(String )
2/1/2012 10:29:57 PM: schedule error: NotFound
2/1/2012 10:34:08 PM: schedule error: NotFound
2/1/2012 10:41:10 PM: schedule error: NotFound
Another thing I notice is that although I do have recordings scheduled for future programs (that I set in Media Center on the PC) when I go in the app to TV > Recording Schedules it comes up with an empty list.
I can, however, bring up the list of already recorded programs in TV > Recordings and view those since they are now actual saved video files on my PC and the app is finding them okay.