Members reporting "invalid response from server" when they are clicking the thank you button? This is not all the time but appears to be random, any ideas?
All member groups when thanking to reveal attachments are getting "invalid response from server", could this be caused by members thanking the replies to see attachment rather than thread owner?
Unless there's a way to reliably reproduce this so that I can produce it on your forum, I'll need one of your users to install Firebug (a Firefox extension) and then have them tell me the error message that's printed inside Firebug's console when they receive the error.
Beyond that, we're soon looking into updating the mod so it's possible the error will go away in time