I noticed today that an "Arcane Scriptomancer" achievement was added, so I edited the Achievements page to add it in. When I uploaded File:Arcane_Scriptomancer.png , the thumbnail came out solid black. The resized image used in the userbox for the achievement (to display on Achievements and user pages) is similarly black. I tried re-saving the image using GIMP and re-uploading, but that did not solve the problem.