I meant, what is the plugin you are referring to here: "..freezing the plugin's state and no amount of knob tweaking and moving sliders making any change." I am only using two simple VSTs (LoudMax, a limiter/compressor, and Wider, a stereo expander) and their sliders move and produce changes as expected. This is with bass_vst.dll version 2.4.1.6 (or 2.4.1.5) and the current version of mb_VST.dll from the Add-Ons section of this site.