Why won't external HD open into Finder Window?

I've got a handful of the palm sized 2 T hard drives here, most of the Western Digital.  They appear on the desktop, with their yellow USB3 icons.  If I double click the icon the hard drive opens into a Finder Window.  All except one drive.  It's the same make and size as the other, same age.  It works.  I can move data back and forth off it, work it FCPX etc., but when I double click it, it doesn't open in a Finder Window.  I can't even do a Command 'i' to see if it's somehow a PC formatted drive.  I'm wondering what it might be, or if there is something I can set to have it open properly.  Maybe it's something in the Sharing and Permissions ... but it won't open with the Command i that I'm used to ... so I can't change anything there.
All ears...
Ben

Roy, first, thanks for your reply, I spent about 1 hr with apple support last week and the guy finally said just reinstall everything saving my user settings and that it would take care of the problem, it didn't. In answer to your questions:
I upgraded to everything you suggested and still no luck (OSX 10.4.8, QT 7.1.3, imovie 6.0.3)
It is actually working in a different user account. I created a test user account and imovie opens right up no problem. It is just in my main user account that it won't open. It used to open, but not recently.
I have had the computer for a little over a year now and have not had any problems up to this point. I was able to do some editing recently, but it took around 20-30 minutes for imovie to open. I can't remember the last time I opened it without this problem, several months at least.
I am running an imac 1.83 intel duo core processor with the above mentioned applications.

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