Does anyone know how to fix the Waterfall Mist flickering issue?

When you place a mist activator (ex_waterfall_mist_01) in front of a water fall activator (Ex_Vivec_waterfall_01), the mist will sometimes disappear. I thought it was a problem with the NiAlphaProperty, but after changing the NiAlphaProperty for the mist to 4845, the problem is still happening. I've also tried adding a NiFogProperty to the mist, but that does not seem to correct the issue either.

Any help will be greatly appreciated.