Posted comments not showing as posted

I click the Post Comment button and nothing happens. But if I click it again, I end up with the comment posted twice! Not consistent, but it happens quite a lot. I've learned to refresh the page before trying again, as it's often been saved even though the page doesn't show that until refreshed.

What OS/browser are you using?

This was a problem on the old site as well at times. It may be a latency issue. Possible on the user end, if not the site.