Protools hanging up with Waves Tune

[Spyderrp7]

I have this problem with my PCs ...
it's dual core , and i have M-Powered 7.1 with USB Transit.
The same problem occurs with my other set-up (again dual core) with Delta 1010 and M-Powered 6.8.
In some sessions , (not all) when I put some Waves Tune plugins the audio engine won't start playing.
What I mean , is that when I press PLAY, sometimes it will start play normally with no problems, but most of the times it won't start playing at all!
So i have to press like 10 times PLAY in order to start the audio engine!!

Any ideas???

[kevinb511]

Open an Aux track and insert Re-Wire, no need to assign an output. Re-Wire running in the background lets you control the PT timeline from within "Tune".