Reading some of these threads I figured this is the best place to post my question about gbXML since most of you have gone through the process at some point and looks like have a sound solution to several questions. We are working on a project with several components (Base building/interiors/Mech/Structural..etc), all my models have been exported to gbXML except for the shell (curtain wall) and the structural model. Not sure what the issue is I dont get an eror message on my Revit screen. The model in the preview box goes grey and the [Next] button also gets grryed out. If some could help with that it would be great.

Thank you