Yep, I've discovered that with Poco and Liquid Mix stuff in the past. Should have remembered that. Well spotted. Has happened with one or two freebie/shareware native plug-ins too. Not a Cubase issue, but well worth being aware of. IIRC if you actually switch the plug-in off in the Cubase insert slot (power button) instead of simply bypass, the problem disappears. At least it did for me.
Thanks for that!
Alexis -Cubase 6.5.0/SX18.104.22.1684, XP SP2, 4GB RAM (1GB not accessible, but used just to balance the computer so it doesn't tip over); Delta 66 in Omni i/O Studio; Motif8; UAD-1