Can't eject FW drives - says app is open, yet none are open

This is mildly disturbing:  After only 6 months of use, I just got a "Can't eject drives" and something about data being "used" or an app being open, yet *no* applications are open - everything was quit / closed before I chose to eject the drives.  Just like I've done for 10 years on Macs.
The warning prompt showed an option to "force eject" which I did not do, nor did I chose "try again".  I stopped trying to eject.  Then, even *more* disturbing, I clicked on one of the drives and it showed "0 items" on the drive.
I restarted and now the drives appear normal.
Just prior to this happening, I had an additional self-powered Glyph drive at the end of the daisy-chain.  Disturbingly #3:  while this drive was connected, I received a warning prompt that said "drive wasn't ejected properly" and it disappeared from my desktop.  I had done nothing to cause this, it simply happenend.  I'm guessing this issue is due to the self-powered factor - I probably should have had this closer in-line to the Mac FW800 bus.
Would this daisy-chain scenario cause the non-eject problem?
Here is my setup:
FW800 out to older Glyph drive via FW400 connection, then daisy-chained to two *brand new* Glyph drives via FW800 connections.  ALL drives were formatted properly when I purchased them.
OS 10.8.5
I remember this happening on 10.7, 10.6, 10.5 etc...  Hasn't Apple figured this out?
Is there a Disk Utility I should run to make sure all my drives are ok?

I don't think that's the case because the drive successfully ejects upon closure of the QT player. I'm not sure if it is the way they wrote file handling in general in Mountain Lion, or if it is a QT Player 7 issue, but it is definately annoying.
It seems that the Volume becomes locked when a file is opened. When that file is closed, the Volume remains locked until the application that opened the file is closed. This seems to work different than it used to.

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