I cannot reproduce the problem:
- I create a sample scene, using a FP object and a teapot as custom mesh. Save it as xref1.max
- In a new scene, i add xref1.max as XRef scene, setting Display Options: Box
- It renders fine using Max 2009 x64, VRay 1.5sp5, FP 3.3.4b
Is this correct ?
If possible, please send us a test scene for checking.