Bizzare DSP/CPU feedback problem ?!?!

[Dopebeat]

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Ok, my rig:

Ptool LE 6.8
Mbox 2
PC with 2.8 clock and 512 ram (yes I am going to upgrade the RAM)

My problem:

I was configuring a dual-mono reverb bus last night. So I could have one side of the D-verb set one way, and the other, the other way. I could choose between which side of the "unchained" reverb I wanted and how much I want piped from each audio channel.

3 audio channels, and the 1 D-verb auxilliary input channel. So I am not doing much here at all.

Everything runs fine, but when I pause play, my CPU usage meters jumps from about 10 percent up to 70-80 percent ! When I press play again, it all falls back down to normal.

After some tooling around, if I give the D-verb no inputs during pause, the CPU meter falls back to normal, if I disable the D-verb channel, everything goes back to normal during pause.

So, while the D-verb bus is not processing any signal and lying idol, I am getting some type of idle feedback loop or something. The only way around it seems to be to disable the D-verb during pause. This cannot be the way it is meant to be !

Maybe there is some preference, or something I need to configure so that all DSPs are automatically disabled during pause or something ?

Thoughts ? Help ? A shotgun ?