Hi Mike,
We also had a problem on 40-50 of our listings in that the first picture was not showing up.
We got this message from E-Bay:
"We were not able to copy your picture. The server containing your image was unavailable when we tried to retrieve it."
This occurred when we tried to use the "fix your picture" application on E-bay.
In "image management" on your site we looked at the thumbnail photos that were uploaded. When we clicked on the ones that had failed to show up on E-bay we discovered that there was no picture there, even though the thumbnail was.
Obviously this was some failure to upload correctly on our part, or to transfer the first picture to E Bay. We are going to change the upload process to one of our faster computers to see if that helps.
For your other customers, they might want to check the upload status this way.
As a workaround, we went to our store and chose listings where the header/gallery picture was not showing up. We went to our first picture in the body of the listing and copied it to our desktop, just naming it #1, etc. Then we revised the listing using that picture. We clicked on "remove all pictures" first which actually only removes the gallery/header picture. The others are on your server I am guessing. We clicked the standard tab instead of self hosting. Then we uploaded the picture from our desktop. This saved us from having to find the file in our computer.
It got the picture to show up finally, but the supersize function will not work when doing it this way, which I can understand. It also will be a problem to relist the item later, but at least it shows the picture with our listing on E-bay.
Overall your product works just fine, but more server capacity would help.