Steam Fails to Start on New Linux Mint 18 Installation

I just started a new Linux Mint 18 installation and installed the Steam client.  After pulling an update on first, run, the client refused to start.  Executing from the command line, I got this error:

SteamUpdateUI: An X Error occurred
X Error of failed request:BadValue (integer parameter out of range for operation)

I googled the issue but couldn't really locate anything for this new Minty release.  This box was formerly my Window10 box -- I recalled that although aging, the box has a fairly decent video card installed instead of my normal practice of using the mobo graphics chipset.

I loaded the Driver Manager from the System Settings and saw that I was, by default, using the open-source version of the nvidia drivers.


I selected the proprietary driver and restarted. 

Success!  Steam started immediately and I was able to access my account:

Hope this helps someone else with similar issues...