Admin Forum:Problem with thumbnails in category galleries.

A while back I noticed that many pages simply will not display a thumbnail in the category gallery on the pages of the categories they belong to. Take this category for example where the two pages lacking thumbnails date back to March and April, but the correctly displaying pages date to the same times. All the pages essentially have the same structure. Can anyone tell my why some won't update and how I can make them? -Revitalizer 17:19, June 10, 2012 (UTC)


 * Same thing for the related pages navigation on the bottom of articles. I see this on number of wikis in these days.