I'm actually experiencing a similar problem, albeit not down to a mismatch of Coppermine versions, and so far as I can see I'm not getting the same error message, but I am unable to view displayimage.php popups on my gallery (version 1.3 throughout). Clicking small image versions in Firefox wields no messages because of the browser's own setup but IE use prompts a Javascript message complaining about a missing object on line 170, character 1 - looking at the script, this is simply a blank line between two 'if' statements. I've tried two upgrades that ran successfully but to no effect, both to the latest stable version of Coppermine.
Can you post a link to your site ?
http://www.mthomson.co.uk/gallery <- there we are.
Hi, see in your theme's template.html
<script type="text/javascript" src="/gallery/themes/studiomt/scripts.js"></script>
scripts.js is in the root of the coppermine gallery, so it should read just
<script type="text/javascript" src="scripts.js"></script>
And lo, it works. Thanks kindly.