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After upgrade, I got something weird problem.
Arcade does not show any cover images even after i selected or downloaded images. But in each game, Cover images exists. Really weird.
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