I briefly tried it but didn't have a key. Something happened, all 4 cores went to a 100%, CAD was super slow at displaying. Killed the WinOS2 session and things were almost back to normal except the WinOS2 session became a zombie, but at least CPU usage dropped. My guess is something to do with the tcpip stack as I assume it used the stock winsocket, which connects to the main tcpip stack.