I think there's a step missing in the upgrade process listed above. When I upgraded from 1.1 to 1.3.1 via the steps on the front page, the game would always hang on playtesting. However, if I made a new project then copied over all my files to the new project, it ran fine. Weird. Any idea what might have caused this? Or was it not meant to go from 1.1 to 1.3.1?
And yes, before anyone asks, I copied the .js files over to update them from Newdata, as stated on the front page.