Hi,
Ok, I see, so you don't want this to be related to the various instances over the network, but rather only available for your "isMine" character.
so, you should have all the logic of enabling and disabling the collider ONLY working if "isMine", that includes both enabled and disabling.
If you keep struggling with this, I'll come up with a sample. Photon has created new samples that shows just that, so I'll port them to PlayMaker.
Bye,
Jean