When I try to open the newly installed Messenger, after I sign in properly, the messenger window freezes and does not work (everything else on the computer works fine, and I can even move the frozen messenger box around, but I can do nothing with it) - not even the menu appears. 

After a few minutes, if I click on the box anywhere, an error message pops up saying "This option is not available because this service is unavailable".  What is going on and how do I open this new version of Messenger?