Arcanebits,
Having same problems with the CocoonJS Launcher!
I've tried launching projects made with r128.2, and it just exits. But when I try launching a project made in r116, it works fine?
Not sure what's going on, I tested these same projects only yesterday and they were okay (haven't made any changes since then).
I did have a similar problem when CocoonJS launcher stopped working a few days ago. I tried it again next day and it was all fine again. I'm just hoping the same applies this time!