What I meant is the problem doesn't happen if I disable the light effect, or I disable the mirror effect, or both at same time of course
I am not sure it come from the overlay since the Galv Layer plugin has the same issue but I'll ask still
Ok, sorry I could not help much, but I need to reproduce the problem first before I can investigate what is happening. You could try some kind of preloader for your water layer graphic or whatever it is that blinks. It could just be that the plugin is struggling to load it in time when it also has to load mirror sprite + light sprites, I am not sure.