Hello all! If, like me, you are sharing your Mac-based media with an Xbox 360 via the Connect360 application, you may have encountered some MP4 or h.264 video playback problems stuttering, slow access, and so on. After the usual round robin of restarting the Xbox, the router and the host Mac, playback was still faltering. Bah. However, after a bit more fiddling about, I have found that the solution is to sign out from Xbox Live (quickly accessible by pressing the big Xbox button) before connecting to the host Mac. You might also want to rebuild Connect360's video library database (point Connect360 to somewhere else, then back to your Movie folder). Hopefully this will solve any problems until the next Connect360 update!