Although I'm kind of confused by the results being reported in this thread.
The HTML code is a little quirky in that threads will show you your avatar from upload.democraticunderground.com while it shows everyone else that avatar from whatever domain the page is being served from (typically www.democraticunderground.com), except on the reply page which also shows other people the avatar image from upload.democraticunderground.com. (Like I said - quirky.)
I think they did that to more quickly demonstrate that the upload worked to the user. They probably update the upload.democraticunderground.com domain right away with the image, but wait until a daily scheduled synchronization to propagate it to the other sub-domains. (I am guessing that's what they are doing.)
Here are the images from each sub-domain:
www: 
upload: 
For me, the top one is your old avatar, and the bottom is your new one. Which may be a web browser cache issue on my end (and you may be experiencing the same issue). Depending on your browser and operating system, there are different keyboard shortcuts to force reload a page from the internet while bypassing your cache memory. For Windows, usually ctrl+F5 will do it. (Google your browser/OS "force reload" to find the right keys.)
If the images above are still different after that, the DU servers are not synced up yet - give it a day and do another web page force reload to see if it is fixed. I think you did everything right, you just have to have some patience for the computer servers to get updated.
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