Hi,

we had the same issue here, using the Windows x2go-client 4.0.5.2 (Qt 4.8.6).

Solved with the current Windows Client from https://code.x2go.org/releases/binary-win32/x2goclient/releases/4.1.2.0-2018.06.22/x2goclient-4.1.2.0-2018.06.22-setup.exe.

Greets