When an weird CSS selector is present in the page styles (e.g. "fb:foo-bar" on techcrunch.com), an exception is logged into the console and the audits fail to terminate, thus leaving the Audits panel in an inconsistent state.
Created attachment 52037 [details] [PATCH] Suggested solution
Comment on attachment 52037 [details] [PATCH] Suggested solution Clearing flags on attachment: 52037 Committed r56792: <http://trac.webkit.org/changeset/56792>
All reviewed patches have been landed. Closing bug.