In answer to the first question, Yes you can still create and submit auctions on ebay.
On the 2nd problem, changing a photo on an ebay auction using the ebay revise listing and upload to ebay, won't automatically change a stored photo on Auctiva's server. You would need to update the photo on Auctiva in your Image library using Image Management and Replace.
On the third question, the ebay Revise listing should give you the ability to delete or replace a problem image. However, it might be best to post the links to the problem auction(s) and/or the auction #'s and explain the problem with each in the Forum. I or someone else experienced with that type of problem can give best advise on how to proceed.
Danno