No. My modules aren't grouped.
No. I don't have an high load of units.
No. I don't have an high load of CQB units.
No. I don't have a large map.
No. It isn't a custom map.

This drove me nuts, and I still can't get the bottom of this.
Downloaded Alive's mission Pyrgos Assault. Got infinite loading screen.
Started to try the quick tutorial built on Stratis. Got infinite loading screen.
Downloaded Alive's mission Scavenger. Got infinite loading screen.

At the firsts attempts I thought it was our problem, maybe something server related.

Redone the scenario by the quick tutorial on Stratis Map. Got infinite loading screen.
I started to search something about this problem. Found some posts here.
Ungrouped the modules. In the meanwhile I changed something on the scenario on Stratis. Previewed, everything was loading and working fine.
Status on modules: [ Bluefor ] Military Placement, Military AI, Military Logistics, TAOR1 [ Opfor ] MP, MAI, ML, MCQB, MCP, TAOR1
> yeah.jpg
Teammate starts with Alive, I explain something to him, then i link the quick tutorial steps.
" Something isn't working, it doesn't load. "
Told him to ungroup modules. Got infinite loading screen.
Starting to add something on my mission, change some details.
Got infinite loading screen.
>wtf.jpg

Starting to deconstruct my mission, trying to test which variable, module, mod, setting is making this Infinite load trigger.
Spent a lot of time, and still can't get an hint about it.

I try with just the 3 essentials modules. Ok
Military Placement. No TAOR. Ok.
Military Placement, Military AI, No TAOR. Ok.
Military Placement, Military AI, TAOR assigned. Ok.
Military Placement, Military AI, TAOR, Military AI for OPFOR. Got infinite loading screen.
Military Placement, Military AI, No TAOR, Military Placement OPFOR, No TAOR. Ok.
Military Placement, Military AI, TAOR, Military Placement OPFOR, TAOR2 < overlapping with taor >, Got infinite loading screen.
Military Placement, Military AI, TAOR, TAOR2 < overlapping >. Got infinite loading screen.

I am no expert, but i can't get where is the problem.

I am not obviously attacking the Alive dev team, wich made a really stunning job, creating the best tool for mission makers by far. But this thing is a major issue, because it hits in the heart of the mod itself.

Best regards