Hi Community,
In order to use the Auctiva Uploader through Internet Explorer, the Active X component should be installed on your browser (which you should be prompted to install automatically when you visit the Auctiva Uploader page) and the component must be enabled. To check on these things, you will want to select Manage Add-ons -> Enable or Disable Add-ons from the "Tools" menu within Internet Explorer.
The initial list you are presented with should be called "Add-ons currently loaded in Internet Explorer" and the add-on you will need to look for is called "Auctiva Image Uploader". If you see it there but it is disabled, go ahead and enable it and that may resolve your problem.
I'm not aware of any specific compatibility issues between Internet Explorer 8.0, however, as Danno mentioned, it is just a BETA version, so it likely has a number of issues that Microsoft will need to get ironed out before they release it from the BETA stage.
If you find that the Active X component is not installed and you are not prompted to install it when you visit the Auctiva Uploader page, or you have it installed and enabled and the Auctiva Uploader still doesn't work, I recommend contacting our customer support team using the web form on the following page of our site:
http://www.auctiva.com/help/requesthelp.aspx-Mike