Same thing happened to me... I am a power seller with thousands of items and photos...
Most have disappeared or are in the process of doing so.
I really liked Auctiva and didn't mind paying them a fee to store my photos, however, I have MAJOR, SUPER issues with them deleting the photos I paid to have stored.
This is costing me much money in time and I am really pissed off about it.
I really believe they were deceptive and dishonest and it is only a matter of time before someone/legal action, will make them pay for their dishonesty.