Forum:Trouble With Changing Logo

I have been trying to change the logo for my Wiki, but it doesn't seem to be taking. I have a .png file, and have labeled it correctly (Wiki.png) and it is also within the necessary size requirements (171 x 128 to be specific). Any idea would could be causing the issue? Thanks in advance.
 * Try Hard Refreshing.  Manyman  (Talk)  02:40, July 4, 2010 (UTC)