External CD/DVDRW drive on MacBook Air OSX Lion 10.7.5

After a recent update, my external CD/DVD RW drive will write cd's/dvd's, but will not play dvd's like it did just days ago.  I tried restoring to a point where I knew that it worked, no solution.  I repaired disk permissions, no solution. Checked for any new software, still no fix.  Any help is greatly appreciated.

To caveat this problem, I can no longer sync my Garmin 401 with Garmin Base Camp on my MB Air.  This occured at the same time, and I get the same error message "The disk you entered is not recognized by this computer" (or something along those lines) with the option to ignore, or eject.  Both issues began at the same time, and corresponded with the update that I installed earlier this month.  Any assistance or future fixes are appreciated. 
Also- the dvd i'm trying to play is a store-purchased DVD, brand new, tried the one that it played just two weeks ago, and another one, neither of which played.

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