I am trying to insert a logo into the header on my site by going to Appearance > Themes > Options. I click on the Custom Logo box and have uploaded my logo file (a 183 x 60 pixels .gif file) both by clicking Select File and Browser Uploader as well. It will show up on “Add media files from your computer” dialogue box — I hit save and then a screen that that includes “Media, Order and Actions” comes up, but is blank under those headers. I click the X to close out of that box, to go back to the Options panel and the Custom Logo box is empty. I click save and nothing happens — no logo. What am I doing wrong?