Hi edsche, MP is in EVR (I´m on Windows 7 64Bit, MP 1.1.0 ALPHA and latest SVN). And it happens here without playing anything. Just the RSS on the screen, waiting some time - full stop of MP. Be sure to compile it against the latest API - there where changes. We just had this also with the ScoreCenter plugin and atm with the HTPCInfo plugin - so at least you´re not alone .
i am running evr in vista with MP 1.0.2.
I have the same exact problem as catavolt. The freezing happens without a movie playing. Just waiting on the home screen.