Believe it or not, I was searching the forum for the OSC plugin info. and solved my first problem on my own. In case anyone else is having problems with Gallery and GL like I am, here's the answer.
I'm using the included 'professional' layout and I had to make one change to the file 'header.thtml'. I removed the following line:
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<?php header ('Content-Type: text/html; charset={charset}'); ?>