Seriously Google, what the hell is with your Youtube eh!? It randomly happens that I want to post something and when I click in the comment field, all I get is a popup window that has “googleplus” mentiond in the URL, that window closes and I still can’t post any text. If I click in the comment field again, the same thing just repeats forever and I’m unable to post. And yes, I’ve also tried disabling all browser add-ons and nothing changed. Fix the damn thing already because it’s annoying as shit.
To me it seems like Youtube fails to connect to Google+ somehow and Youtube then fails to give you ability to post comments, because some sort of Google+ credentials aren’t present or something. Can’t find any other logical explanation because Youtube seems to work just fine otherwise (can watch videos and stuff).