z3ta+2 & audio dropouts

My Lynx soundcard application reports incidences of audio dropouts. Sometimes, I can hear them. At first, I thought that this was a problem with my new PC, but I have narrowed this down to z3ta+2; these dropouts only occur when using this particular SW synthesizer. I also use Alchemy, Rapture, and others, with which I do not see this problem. The dropouts occur whether I am using z3ta+2 standalone or withing Sonar X1. Anyone else have a similar experience? thanks Keith