Hi,
I believe disabling only stops appending the gallery to future listings. I know that disabling doesn't remove the code from active listings. However, it might also stop populating/updating the Auctiva Store page with listings (that I've never tested but suspect). I see you link to the page. It's a question you might pose to Auctiva Support with a support request. Note....you need to change the code for that link anchor to go to target="_blank" page (per new eBay policy on off-page links).
Change this: <A href="http://www.auctiva.com/stores/viewstore2.aspx?id=1039863&display=thumbs">
To this: <A href="http://www.auctiva.com/stores/viewstore2.aspx?id=1039863&display=thumbs" target="_blank">
I see you have a very large group of active listings. I examined several dozen of the newest and didn't get a load or scripting problem using IE7 to view. They did have the Blackthorn logo at the bottom.
Are you using a different browser to get the scripting errors?
Are you viewing them with the classic blue accents eBay listing page or the New layout design gray page?
Danno