Razorbrain, I know it works for you, it should. Leaks are not whether it's working or not, the full name is memory leaks. It's when (example) you create a special effect at the position of a unit. If that location (the position of unit) is not destroyed, it will stay there and take some memory, so when you create lots of these locations, your map will lag like hell. Imagine it like this, try putting 10000 units on a map and test it, it bet it'll lag because each unit takes some memory, and causes the game to leak. Same for Unit Groups, if you go pick every unit, then WE creates a group so he can do what you said, but if that group isn't destroyed, it will leak.