As many of you already know, eBay has been experiencing a couple of problems with their image service off and on since this last weekend. Gallery images not showing and a failure to be able to upload images altogether using their image service are the two main problems being reported.
Since this is an issue with eBay's image service, we are unable to do anything on our side to fix the problem. Hopefully they will get this resolved quickly, but in the meantime, you may want to contact eBay Customer Support and file a report.
Thank you for your understanding!