I'm finding that often (not always), the little submit icon just never stops spinning. I can open the page in a new tab or browser, and the comment is there, so obviously it did finish submitting, but in the original tab/window, it just spins forever.
Same thing is happening to me. I am assuming it has to do with the amount of traffic the instance is getting. Wonder what can be done to help alleviate the issue as it's been happening to me since I joined a few days ago.