Cannot see color on host computer

I've been using LMI for many years now. I've recently had to replace the hard disk on my host PC (windows 10) and reinstall LMI Pro. No issues during the first few days, but now I cannot see color on the host PC (I am connecting to host via a Mac). 

I've changed the color settings and none of them seem to have any effect on the issue. 

I'm running a 50mbps connection on both ends.

Any ideas?