Optionally, I unchecked the boxes “Turn on Mouse Keys with left ALT + left SHIFT + NUM LOCK”, “When using keyboard shortcuts to turn Ease of Access Settings on:”, and “Display the Mouse Keys icon on the taskbar”. Go to Control Panel -> Ease of Access -> Ease of Access Center -> Make the mouse easier to use -> and click on “Set up Mouse Keys”. The solution I found is to enable MouseKeys. When I did this the mouse did appear on the screen and work but… it was HUGE and I wasn’t happy with the result. The default solution to this is to enable “Draw mouse cursor” in the “Other Options” section of MWB.
This is an issue with Windows 10 (and I believe with Windows 8) as it hides the mouse when none are detected. The mouse would be invisible when on the computer that the mouse was not physically connected to. I had an issue when running Mouse Without Borders(MWB) between 2 Windows 10 machines.