Check here: https://www.ads-software.com/support/topic/message-tab-does-not-appear/
After I tried that it shows up on the Messages tab when I view user profiles. Before I do that nothing shows below at all.
However when I go to My Account and view the Message tab there the First button links to my Message tab. There is a second Message button that links to updating my profile for some reason which I’m not quite sure what that does. Maybe it’s just a bug and the button shouldn’t show when I view my own profile and is supposed to be for sending me a message but doesn’t work when I message myself and just updates my profile? Definitely odd.
Another issue I noticed is when I do send a message from the Message tab the green Processing… box never goes away.