Unit selection woes

I reinstalled PA to try to fix the ladder problem. Now i have a problem selecting units sometimes.

1. If I allready have a group i cant deselect by selecting a unit not in the group.
2. I have trouble getting the left mouse button to make a drag box.
3. I have to hit escape 2 times to deselect the current group.

figured it out. Conflict between "Hold the Line" mod and "Missile Command" mod.