I've had a similar issue with Mint 8 but not like yours.
I would push the eject button, nothing would happen, then I'd open "computer" right click the CD/DVD RW+ drive and select and option to eject it... it would say a message saying it's ok to open the drive now and *click* it would open up lol.
That happened a few days (even when the drive wasn't in use it wouldn't open manually).
Eventually it stopped doing it hence why I haven't posted about it. Wierd@ double drives.... I haven't had that issue yet. So far things seem good hope you get it fixed soon! Doesn't seem that bad though more annoying than buggy becuase as long as everything's working tip-top then its all good. When you fix it(if you do) please post what you did for future readers.