Heads up. It looks like the latest .NET 4.7 update is breaking some Autodesk products.
Microsoft is installing .NET 4.7 as part of their auto updates and it is causing many legacy Autodesk applications to crash on any ribbon interaction. Touch the ribbon, away goes your software. We have seen cases where the product will also not launch after .NET 4.7 is installed.
If you can keep from installing the 4.7 framework do so. If the damage is already done then uninstall .NET 4.7 and install .NET 4.6.2 using this download link. Note that the uninstall of the offending version must be done first!