[X2Go-User] Cannot successfully use the x2go client on windows 8.1

I have installed the x2go server under the ubuntu 14.04 on a remote computer. When I use the x2go client under either windows 7 or ubuntu 14.04 on another computer and then connect to the server, the client works fine. However, some problems occurred when I run the client under windows 8.1. Actually I can connect successfully, but the remote desktop is black and I cannot right-click on desktop. When I open the file system or the file manager, it could be very slow (it may take 35~30 seconds to open the file folder).

I have searched on google but found no answer. Is there any configuration for fixing this? Any ideas?