Seems I've been hit by this bug now. Posting comments isn't working in FF13 or IE8. The comment is submitted but the page just reloads with no changes. This only happens on TG, not TH.
In IE9 the script is actually broken and it neither posts a request to the site nor refreshes the page when you click submit. It does, however, send off a couple of requests to some trackers. The following error occurs when clicking submit:
[fixed]SCRIPT438: Object doesn't support property or method 'createContextualFragment'
framework-3.2_th.js, line 2 character 33950[/fixed]
The IE9 script problem happens on both TG and TH.