hello , used some of the one knob max and grit on project  and upon reloading i get following as missing referred plugins 
TL-64 Tube Leveler (Clip: 'GRIT')
PX-64 Percussion Strip (Clip: 'MAX')
Cakewalk HF Exciter (Clip: 'MAX')


project loaded as expected and loaded grit and max worked but not shure why the above (didn't use any tl,px or exciter)
quite like the 'space ' to complement the rematrix as it enhances it and fills the lower spaces better  , by the way is there a 'possible' phase problem when stacking 2 different sized reverbs in series??

I think the Style Dial plugins are simply a kind of FX Chains, just for the Pro Channel. They are based on other VST plugins. If these are missing, you get an error message. (You may need to scan VST folders for Sonar to find them.)

thanks , seems like you are right that they refer to existing plugins