You may be doing nothing wrong. It's possible one or more of the image servers is having a bad day. Usually, those problems are temporary.
Are you able to get into your Auctiva Store and see your items, and are those images OK?
BTW Folks....I'm hearing (grapevine) that a large Internet Service Provider is having a very bad day. Even my Internet Phone (MagicJack) isn't allowing outgoing calls.
Life on the Net is always an ADVENTURE.....
Danno