So what is mcdvd_32.dll?
MainConcept DV Codec according to
Yeah sorry, it was kinda stupid of me to ask that question to the list rather than to google.
I am not sure, but try moving the dll out of the way,
I removed it and it work. It wasn't easy though; I tried to uninstall it politely in the "video codecs" panel of Windows' Device Manager... but it just wouldn't disappear. So I deleted it manually, and even if according to Windows it is still in the codecs list, GEM now works fine.
At first I thought the file was magically regenerating itself, since after deleting it it and searching it would still be found... but then I realized it was found in the Trash.
Thanks m.