Hi retro,
It sounds like there may be a pop-up blocker activated on your system or browser that is preventing the "Add Images" pop-up window from being displayed. Even though the pop-up blocker on your browser may be disabled, there could still be another pop-up blocker, perhaps associated with a toolbar or internet security product you have running, that is causing this problem.
In any event, once you have disabled all of the pop-up blockers on your system or browser, you should no longer experience this problem. If you would like assistance troubleshooting this issue, please file a support request using the appropriate link on our help page:
http://www.auctiva.com/free-auction-software-help/help.aspx-Mike