Question -  
If Revit crashes for unknown reasons ..  A common possibilities is ‘MEMORY’ ..  
Try this !


1.  From Window’s desktop, right click =>  Properties

2.  Click on the Settings tab.

3.  Click on the Advanced button.

4.  Click on the Troubleshooting tab.

5.  Move the hardware acceleration slider all the way to ‘None’.

6.  Click ‘Ok’ & ‘Ok’ again .. and Start Revit again.