Just now saw this thread, had the same issue as well.
So far found if you switch from the box art view to screenshot view and then back, the covers pop up. Seems like it doesn't automatically refresh or something like that.
For me the Boxart was sorted into the screenshot dir. But only for MAME, the rest it sorted correctly. I had to move the two directories around before it showed up correctly
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Just now saw this thread, had the same issue as well.
So far found if you switch from the box art view to screenshot view and then back, the covers pop up. Seems like it doesn't automatically refresh or something like that.
For me the Boxart was sorted into the screenshot dir. But only for MAME, the rest it sorted correctly. I had to move the two directories around before it showed up correctly