When I installed my gallery (using media 7.x-1.0-beta3) I expected a nice grid of thumbnails. Instead each thumbnail image was stretching to the full width of the content area. (This appears to be the same issue as #25 in http://drupal.org/node/1030942 but is a separate issue from that thread.)
After a little poking around I found that it was no more than a simple CSS error. I haven't tested this patch extensively but it's working for me. I hope this saves some headaches for others!