[ac0mputerguru]

I also have the same problem...but it IS only on version 12. I have v12 on my laptop and v11 on a computer connected to my tellie. Just for kicks, I turned on the update library option on both machines and got two TOTALLY different results. v11 runs like nothing happened, except processor load and (obviously) network and HD activity. v12 went spasmatic on my butt...it flicks the screen really fast with the XBMC logo and my pointer leaves trails. This goes on for 5 minutes or so, then the screen goes black and after some prodding, it eventually lets me into the home menu. Not sure if it's add-ons (Library Updater) or what, but I've turned the option back off and it doesn't seem to fix the problem...

VERY strange!