I'm getting the same problem with all ALiVE missions. I can't load any of the missions available on the website and following the "quickstart" tutorial from the ALiVE wiki still produces the infinite loading screen. I'm not really sure whats causing this as I've tried with just @CBA_A3, @ALiVE and @ALiVEserver but the same error persists and it usually ends up with me having to alt+f4. I'm using the latest ArmA3 beta update from steam.

Edit:BTW, Loved MSO for ArmA 2 thx for all your work. :P
Edit2:Here is my custom mission which is all basic ArmA 3 units besides the island addon http://www.filedropper.com/alivepantherapanthera3