1.7.2 did A LOT to the plugins guys..... I know because it jacked up my test server..... my permissions plugin had to be completely redone, which is basically enough to want to throw my computer through a window, so I am retiring the server....lol
Towny is still being worked on and being tested. Please be patient until there's a post on the main page saying that it's open. I have no set "open date", so asking will leave you just as clueless as I am. All I can say is that it shouldn't be too much longer before it's open.