Effect Engine problem

Has anyone ever had this problem?.......

Lets say i have 6 Elation Platinum Spots and 6 Elation OptiTri Pars that im working with.

I created a stop effect button in my effects pallet that would stop any effects that i am running. When i select a group of fixtures (say my platinum spots) and hit my effects stop button, all the fixtures will stop but the first one. If i select both the platinum spots and the OptiTri Pars, all the fixtures will will stop except the first fixture in each type.

Does anyone have any idea why this is happening?
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