My first bug report. Anyway, not sure if this is a bug in XBMC or the PM3 skin, either way, hopefully it can be easily fixed and also not cause a problem for MC360.
Running latest T3CH build (as topic) and this is what I did to notice the bug:
I edited the XboxMediaCenter.xml file (only two minor changes) to have 2 folder depth for the programs section under applications (which works fine) and to have an extra tab in applications (which makes the bug appear). Anyway, this is what it does, if you have animations on you know how the left hand side with the options appears onto the screen when you select applications from the main page, well the bottom option (in this case DVD-Game as I added my extra option higher up) doesn't come on to the screen by the animation the others do, it is just there (would be much easier to see what I mean if you recreate it), anyway it is selectable as it should be and if you back out of applications it is animated on leaving the screen, just when it appears on the screen the animation doesn't work correctly. I hope this is enough information, if not I can upload my XboxMediaCenter.xml file.