I posted this elsewhere but got no replies, perhaps it'll do better here! Minor but annoying problem. I've got GIMP 2.8.4, and all of a sudden the jpg and avi thumbnails in my folders have been replaced with the generic grey-and-white-chequered icon with a clock in the middle. In "Properties" Gimp is still set as the default to open the jpgs, which it does, but I want my thumbnails back! .avi defaults to open with Movie Player. Running Gnome as my default, btw. Oddly enough, when changing to LXDE, I get some thumbnails; but only the ones I have previously opened in Gimp. In LXDE, if I open a "grey" icon jpg in Gimp, then update the folder, lo and behold, I get the thumbnail back! Any ideas please?