Hi Rui,
I saw on Twitter you’ve disabled Disqus as you couldn’t get it to work. If had a quick look at opcoesbinarias (which I guess is the site on which you have the Disqus-problem?) and I see there are JS-errors due to addthis. These errors are very likely to be the reason why Disqus isn’t working when AO is active; as all JS code is aggregated, one error in the JS-file stops all execution.
Possible solutions:
* exclude addthis from being autoptimized (add “addthis” without the quotes to the “exclude from JS optimization” list in Autoptimize settings
* enable the “try-catch wrapping”-option in Autoptimize settings
Hope this helps,
frank