My standard installation is working now, except (I noticed this with the portable, too, just didn't have time to test it) the artwork view loads to a certain point and then stops loading new images until I restart MB. I haven't seen any pattern yet - sometimes it's a whole bunch of images, sometimes it's just a few.
Also, sort of a tangent, but Artwork view is not holding its spot after restarting. It always returns to the top.
Hmm, worked the last time. Maybe related to why the loading stops, some setting wasn't being saved because things were stuck?