I configured IE5/Mac OS X to display JavaScript Errors. When I edit a skin in the skin editor the browser reports an error at the line: <script type="text/javascript" src="xxx.antville.org"></script> I suppose it's because the script at xxx.antville.org/javascript contain the html script tag. Can you confirm this?

yes, if you have modified the javascript-skin and it still contains the html script-tag, you'll get an error. during the last update here on antville.org we changed the javascript-skin in the database for those weblogs that had already a modified frontpage-skin by adding the html script tags (because we switched from embedded javascript/stylesheet to external ones). but we didn't change the skinmgr/page.skin during the update.