Sorry that part is not correct. We did not make that change for Mac until July, in 2.1.3-alpha.
If using that new SessionData temp folder helps, then you can obtain 2.1.3-alpha from the top of http://www.audacity.homerow.net/index.php?dir=mac/. 2.1.3-alpha is not a finished version. It has a lot of bug fixes compared to 2.1.2 but may also have some new bugs. You should still delete the entire /Users//Library/Application Support/audacity/ folder before trying 2.1.3-alpha.
Gale