With OS X 6 on my iMac Intel Duo, the screen could go off (power save) on long file conversions in MPEG Streamclip. Since updating to OS X 7, if the screen goes off to power save, when I turn it back on later, MPEG Streamclip "quits unexpectedly" and all material is lost. If screen is left on, all works well. Anyone else have this problem? What to do? Thanks.