I have the same issue regardless of the input on the monitor:  HDMI 1 or HDMI 2.

HOWEVER, THANK YOU.  There are TWO outputs on the back of the KVM, both HDMI:  Output 1 and Output 2.  No idea WHY, but switching THAT from Output 1 to Output 2 solved the issue.  

Much appreciated.  Wish I could give you Gold, but you know, Reddit Owners suck.