Some gateway's go fine, some not errors:
50331656 cannot connect to the remote gatewayserver
If I connect manually with mstsc it works fine.
I think some change in the newest windows build have broke something between mremote and the rdp protocol.
If I rollback my os to a point before the update it works again.
Windows 10 Anniversary update
Mremote 1.75 + 1.72 tested
Ts-gateway servers are windows 2008 r2 / 2012 / 2012 R2 from different customer's