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I have installed Processing 3.3.6 and 2.2.1. Neither will launch. I'm running Mac OS 10.11.6. I've tried deleting the plist files in the Preferences folder. This does not help. This is fairly urgent, as I am teaching a class in Processing tomorrow morning.
Answers
I can update by saying that it will run when I'm logged into another account on the same computer.
Glad that you found a workaround!
Might want to do a complete uninstall of both to fix your original account. I recall some old issues where certain versions (not the latest) had Java conflicts -- did you install 2 after you installed 3?
Might want to report as an issue if uninstall-reinstall doesn't work. Good luck!
https://github.com/processing/processing/issues
Thanks, Jeremy. As it happens, I discovered there was a conflict with BetterTouchTool. I deleted the macro for Processing in BetterTouchTool (and then recreated it), and now all works fine.