Hi PSI, I finally got your capx working properly on my system...sorry about the delay. I see the problem as you described it and will try to fix it tomorrow.
In the mean-time, why don't you simply compare the x position of the enemies to the player they are chasing, and mirror or not depending on if the player is to the right or left of the enemy? That would be way easier....is ther a diference in the behaviour of the enemy that you are after that would make this not a valid solution?
Mike at BrashMonkey