I have a gamelogic with the following:

[format ["%1_blackScreen", missionName], false] call BIS_fnc_blackOut; enableSaving [false, false]; ShowHUD false;

First time I play the mission, it works. But when I export it to single missions and play a second time, the blackscreen doesn't activate! Also, sometimes the player and nearby units appear on the map briefing screen. However, sometimes they disappear and it is on these occasions that the blackscreen fails to activate...