3D Preview of CATProduct in 3DDrive don´t get any result

We want to use the 3DDrive for viewing CATIA V5 Products in the early biddingphase to avoid loading unncessary data into the platform. 

So, I load 1x CATProduct with 23x CATParts up to 3DDrive. The 3D Preview on all CATParts works fine, but the 3D Preview of the CATProduct did´nt work. After more than 30 minutes I stoped the calculation. 

Could anyone help me?

Many thanks in advcane.