R-MIX & VST instruments problem

SONAR X2PE, Athlon FX6300,4GB,1TB,ASIO,TC Konnekt 6, Win 8 x64, Win XP x32.
Hello. I want to share with you a problem if you use R-MIX plugin along with the VST instruments entered in the Projects. It works quite well and is stable as long as I do not include  R-MIX plugin . The sound of instruments entered starts to disappear in part in any VST instruments in Independence are using. Tried in both systems Win 8 x64, Win XP x32. I am use last updates for SONAR X2, but it change nothing!
Who had such a problem and how to solve it?