3D object disappear

Hi

 

Having a bit of a problem, in translation to and from Acad 2009 and Bricscad. The Three dimensional model opens in Bricscad, without issue, but when saved and reopened in Acad there over a 1000 errors reported and alot of the 3d objects are missing. The recover appearently deletes them as bad objects. Is there a work around for ths problem. I would like to recommend Bricscad in my office but this glitch will certianly kill off any chances of the management accepting the proposal.