Thread:Project:Support desk/Broken Thumbnails in Mediawiki 1.20 (2)

Okay, I've been trying to fix this for the past hour. If I try to upload a large image, it comes out as a broken thumbnail. Click it and the image is fine. How do I fix this??

http://zelda-sanctuary.net/wiki/File:Link_SS_5_test.png

I use a Linode Linux Server.