[pluggo] Sound arriving too early in Logic Pro 8.0 when Pluggo plug-in inserted

I have experienced this with several plug-ins: the sound comes too  
early, something like half a second or so. It doesn't always happen,  
and it doesn't always happen at the same moment.

I have tried to disable the ltency compensation, it doesn't solve the  
problem.

I have tried to remove other plug-ins inserted upwards, it doesn't  
solve the problem neither.

It's really annoying.

Any idea?

Roald Baudoux