I just hacked my GH1 for the first time and selected the option to allow higher ISO's in Movie Mode but when I start recording the ISO indicator on the LCD display changes to Auto from 800. This happens even when I record in M or S mode. furthermore when recording in Movie Mode the exposure becomes under exposed even though I had it set properly before hitting the record button. The exposure stays locked in the other modes. Is there known problems with the ISO option for Movie Mode and could this be the cause?