What units were you creating when this happened?
What units were your allies/enemies creating when this happened?

If like say a player is protoss and had 12x stargates producing 5x carriers each they count as units still thus adding to the 1600 map limit so if they or you were producing the units the map would be maxed out its basically just a race to see who clicked creat unit first =\

XBL: GreatThanatos69