I'm not quite sure how it happened... I was going through my library opening, closing and purging files, when all of a sudden the "open frame file" window doesn't look like it should. It looks like your standard windows file browser, instead of the Pangolin frame file browser with the preview window. I've tried restarting Pangolin and my computer, but it's still not giving me the preview window I need. Does anyone know of a solution to this? Thanks in advance.