See here:
http://blog.miranda.or.at/2011/05/how-to-fix-disqus-plugin-for-wordpress-3-2-beta
It’s a JavaScript problem caused by the upgrade to jQuery 1.5.2 in WordPress 3.2b1 which does no longer allow unquoted selectors.
Fix is fairly easy, modify one line of code in the disqus plugin (until they release a plugin upgrade, hopefully soon).
