Digital Nature Tool... BUG

Hi everybody,

I buy DNT 3.5 for Softimage3D 3.9.2. and I'm having trouble with the render:

If a create an Ocean Grid with LOCAL option, I could render the scene, but if I create a Ocean Grid with GLOBAL option, at the render time (preview) Softimage is freezing, and the Memory size in increase and increase... I wait 5 minutes and It's freezing all the time.

Somebody have an ideas ?

Sorry for my poor english. Thank you for you suggestion !
Carl G.
Montreal p.q.