I'm testing adaptavist-plugin-themeBuilder-3.3.5-M3-conf210.jar on Confluence 3.0, and I'm running into an issue where the "Theme Administration" Panel shows only the tab bar.

Investigating with Firebug, I find that lines 3-4 of /s/1627/10/1.0/_/download/resources/confluence.web.resources:master-scripts/PageNotification.js assign dwr.engine to {} before /plugins/servlet/builder/dwr/engine.js runs. Line 21 of that file observes that dwr.engine is non-null and does not fill it in. Naturally, nothing after that works. If I set a breakpoint before that line and re-assign dwr.engine to null before the check, the page loads fine. (the URL's are relative to the internal Confluence instance I'm testing with; I hope that's enough information.)

Is this a known issue? Is there a proper fix available?