Welcome to GreedyGammon
Someone else had recently reported an issue with display.
That was resolved by changing a setting to lower the scaling factor
This issue was resolved by adjusting the app size scaling factor from screen preferences as per this Microsoft forum post
After updating from windows 8 to windows 8.1 my screen resolution fell from 1920 x 1080 to 1536 x 864.
All my graphic card drivers are up to date. When I go into screen resolution the screen resolution is set to 1920 x 1080 whereas in reality it is 1536 x 864 as shown by Nvidia Geforce experience.
What should I do?
The simple solution is to go back to the screen resolution display change from right clicking on your desktop and select "Make Text and Other items smaller or larger" and set the scale from 125% to 100% and voila! Your GeForce Experience should now be set to 1080p
If this does not resolve your issue please respond with your normal screen resolution.
Changing the screen resolution away from the recommended size can result in a screen image degradation so we try to stay away from having to do that.
Regarding your high win rate, if you are an advanced player, you can change the dice options to "random dice" from the preferences window.
GreedyGammon allows players to connect to each other.
maareyes (greedygammon support)