Here's the canned reply from Auctiva Support regarding my help request a while back on this problem.
Thanks for contacting us regarding this matter, and I’m sorry to hear about the trouble you are having. This is a known issue to us and our engineers are working to resolve this as soon as possible.
We apologize for any inconveniences this issue is causing. If there is anything further I can do to assist you, please don't hesitate to ask!
Sincerely,
Auctiva Support.