Can confirm. Loaded a mission that was made prior to 0.74(stable) update. Mission hung at loading screen. Report file was 20MB, and had thousands of skeleton errors.

I came across this bug report, and opened the mission in editor. Deleted all armored vehicles, and saved the mission. Replaced the armored vehicles, and saved again. Now the mission loads fine. What this did was place the armored vehicles at the bottom of mission.sqf, which allowed all characters to load first.