Keyshot graying out parts? Imported parts not showing either?

[mat10x]

Hi guys,

Have a scene which is 292.4 mb.  Was working fine until today.

Opened up the scene to work on it and a few parts were "grayed out".  I was able to re-assign the correct material.  Closed the file, reopened...grayed out again.

Deleted the grayed out parts...tried to reimport (add to scene) as new parts from Rhino 5.4.2 (shaded model) thinking something got corrupted.  The parts import, they show in the scene list...but they are not visible at all.  Even after closing all the other parts to find it...it's not visible.  Tried to assign any material/color...nothing.

No idea what happened to this file.  File size issue?

Using a Mac 2014 MacBook Pro
Keyshot 7.3.40 Pro
 
Thanks!