Export and Playback Start Issue

Does anyone else get a Start of Playback issue where a Reverb or other plug-in has some "stored" energy that's released when you first click Play to listen to a mix, and may is still present in the Exported audio file after Exporting Full Mix? I've had this issue ongoing since X1, but thought it was my machine (another DAW doesn't do this). It's much worse and bleeding over to Exported Mixes now in X2a. Tried multiple soundcards, and even a completely different system. Same issue. I suspect it's a Waves problem, but again, only seems to happen in Sonar. I'm having to actually add 4-5 seconds of silence to the beginning of mixes because this happens. Another thing I can do is to play several seconds of silence at the end of the mix to let the plug-ins "clear" out, then go back to the beginning. iNtel iCore7 (8-thread) Proc, iNtel/ASUS motherboards (latest BIOS updates), 8Gigs Kingston RAM, Windows 7 64 and 32-bit, latest patches,Soundblaster/MOTU interfaces (this isn't the issue, though, since it occurs in Exports as well) with latest drivers.