Bristol_Jonesey
I'm missing something here.
There's no reference to a Bi-filter on any of my systems. I have reset & rescanned my vst's
Bifilter 2 is part of the Boutique Suite that comes with Sonar Platinum. So If you are not seeing it and you have Sonar Platinum, then I suspect this can be fixed by (re)installing the Boutique Suite from the Cakewalk Command Centre.