I'm still encountering flakiness with posting.
Click on add and sometimes it's quick, and everything works the ways you would expect... other times nothing happens for 30sec or so before the AJAX "loading" overlay is eventually displayed, and then the update is as expected... other times the AJAX overlay is displayed and then there is and interminable delay before the page is actually updated... while occasionally it simply fails – and you may or may-not find that it actually posted. Clearly, there are still issues there to be resolved.