BIS_fnc_spawnGroup does not work with a number of units passed instead of an array of classnames. I looked into why and it is because BIS_fnc_returnGroupComposition is outdated with old ARMA 2 classnames.

It's not that big of a deal but it obviously can't be more then a 20 second fix to update the classnames because a lot of people like to use:

[position,EAST,6] call BIS_fnc_spawnGroup

to spawn in a fixed number of units without knowing the classname.

Current fn_returnGroupComposition.sqf:
http://pastie.org/pastes/9806988/text?key=jqxa1mizhxux1giwpyagw