Custom Header upload problems

I went to go and upload a new custom header for my blog (http://www.glassofwin.com) and even though the uploader acknowledges that I have a new image, the header space is totally blank.

– Yes, I doubled check my specs to make sure they were 741×142
– I emptied my cache, restarted my browser
– I even tried to upload the former custom header with the same blank space results
– I went BACK to the default header/colors, that worked, but as soon as I tried to upload another banner it went right back to the same problem

– I tried to upload the header before and after I upgraded my blog to the 8.2.5 version ~ same results so I doubt this has anything to do with it.

– When it acknowledges that I uploaded an image it says:
“Header complete! Visit your site and you should see the new header now.” but the uploader does not preview the image for me, as they did when I resorted back to the original header/colors.

Any help is greatly appreciated.