I think it has been mentioned elsewhere in this forum by one of the AppGameKit developers that the v108 betas are actually closer to an alpha release than they are to a final release in the scale of doneness without errors.
v1088 is not an official release at all. They put it out there so we could play with it (and help them find what doesn't work).
Since I don't need 3D, I am continuing with my current project in v1076 (although I would like to be able to used some of the other v1088 functions).
Cheers,
Ancient Lady
AGK Community Tester and AppGameKit Master