Re-tested component-showcase with icefaces-compat.jar containing the minified JS resources but I could not reproduce the problem described above. The JS resources are loaded and evaluated without any issues.
The problem described by http://jira.icefaces.org/secure/attachment/12965/screenshot-01.png is obviously caused by the failure to load compat.js and icefaces-compat.js resources. The cause of the problem must be on the server since the HTTP 404 errors are sent from there.
Modified build to minify compat.js and icefaces-compat.js resources.