Minions get stuck / confused after a fight far away from the home base / core.
They either don't move at all or aimlessly wander around a small area where the fight was and don't find there way back.
Ubuntu 14.04 LTS (64-bit)
Intel® Core™ i7 CPU 930 @ 2.80GHz × 8
GeForce GTX 960/PCIe/SSE2
8 Gb RAM