On my site, I get an error message on literally every private message I send (by 'private message' I am talking about a message you send to another person on the site by clicking on their profile and then click on 'Send so-and-so a Message'). When I send a message, such as a reply, I get an error message (see attached screenshot), but it seems like the message actually goes through successfully. So I am not sure why the system is displaying the error message "Error: This message has already been posted". I am using the Responsive Design, but I am not sure if that is the culprit(?)

UPDATE: As a clarification, this problems occurs only when replying to an existing thread. It doesn't happen when you send a brand new message. Thanks.

Very strange. I cannot replicate this issue. I have logged in and out numerous time between different test members on my test site and I can't seem to generate this error.

The error occurs in both Chrome (Version 47.0.2526.111 m) and Edge (version 25.10586.0.0), so I don't think it's a browser issue. I have replicated the problem on 2 of my 4 class creator sites -- this one (sandbridgebeerclub.com) and another one (sandbridgedunes.com). When I switch the design back to a legacy design, the problem goes away. Then when I switch back to responsive design, I get the error message (again, when responding to an existing thread, not creating a new message). The message content does show up in the conversation thread, so it seems like a 'false' error message. Still, it is a problem because my site members have complained to me about it

@Scott. You are welcome to log into one of my websites to see what I mean. I assume you have some sort of admin privilege to do so. If not, I am happy to create a guest login for your use in investigating this little mystery

Please add me as a guest member and then I can join and we can begin a discussion in the Message Center.

Scott, my Sandbridge Beer Club website (sandbridgebeerclub.com) is set up to allow anyone to join. Go ahead and join and send me a message... I think you will see the error when replying to an existing thread (but not an original message). Just in case, I also added you as a 'guest' member to my condo website sandbridgedunes.com. So feel free to give that a shot also. Thanks.

Tom, Sorry for the delayed reply. Please reply or send me a new message and I will see if I can recreate the issue on my end.

Please see my Jing videos:

Test 1 in Firefox. http://screencast.com/t/yUjMk0qG5Bs8
Test 2 in Chrome http://screencast.com/t/E6Oj2ruz

Thanks
Scott