If you installed Maya 2016 Extension 2 and tried to use the Python beta version of tweenMachine, you probably noticed a runtime error that pretty much stops it in its tracks. Without getting too technical, it appears to be a bug with the Python version of one of Maya’s commands. I’ve submitted a detailed bug report to Autodesk, and hope that they fix it soon. In the meantime, I’ve posted an update that dodges the problem. Grab it from the tweenMachine page and get back to tweening!