Recently I replaced my built-in SuperDrive with a Pioneer BDC-208DBK Blu-Ray Drive from OWC. The drive seems to be recognized by the machine - the eject option on the menu bar lists the right drive, it reads discs (DVDs and Blu-Ray discs using VLC's newest version) etc. But I'm experiencing some odd, intermittent errors. Occasional hanging at startup. Long, unresponsive beach balls when I hit F12 to eject a disk or eject via the menu bar. Occasional failures to launch programs that require drive information, like iTunes, Disk Utility, etc - many of which then seem to build into Finder tripping over its shoelaces and grinding to failure. These are all frequent but only intermittent - any idea what could be going on?