Mac OSX Desktop Blue Wallpaper after session

I am fairly certain this has been widely posted. But to be sure.

On Mac OS when I remote into my desktop (typically from a Windows box), it works fine.  When I get home, my Mac desktop no longer has the intended Wallpaper, but instead all BLUE.   I simply go into preferences and re-add it.   So this more of a huge annoyance.

Any thoughts on how to prevent this?

Mac OSX Sierra - latest updates;  Imac 27" late 2013

TeamViewer version: 9.0.43731 June 2015 (eek i'm way outdated). If the fix is as simple as updating I would feel **bleep**.  But no harm asking the community.