CAD model display issue – General

I have one program built from a STEP file, that whenever I open the program, the model flashes for split second and then goes away.  I go to CAD > View > Re-draw CAD model and I’m good for the rest of the session.  If I switch a window over to another measurement plan and come back, I have to repeat the re-draw process.  The icons along the bottom do nothing.  I’ve created a new MP with the same model and it happens again.  I’ve healed the model, no difference. The STEP file is 3,590KB so I’m not sure if it’s a size thing.