I've had this iMac for a year or so now, and have installed Perian long ago. FLV files would play flawlessly in quicktime, but recently It has stopped working. Quicktime still plays other video formats, but whenever I attempt to open a .flv file, it says "Mac OS Error -50" Anyone else get this? Perhaps it was a recent software update that has done this, or maybe something is corrupt ? Any help would be appreciated.