User blog comment:DaNASCAT/Technical Update: May 24, 2011/@comment-3080486-20110527082953/@comment-1656630-20110528191648

a few questions:
 * 1) if you click "Preview" and wait a bit, does it appear there?
 * 2) does the wordmark you're uploading meet the size requirements?
 * 3) have you tried checking back in a few hours to see if it's appearing on a delay? (i'm guessing yes, since we're still talking about it)
 * 4) have you tried again today?
 * 5) can you upload other images to that wiki via "add a photo" tools?