VNC remote administration uses wrong characters

Hi, we wanted to set up remote administration, especialyl remote login for all users, using the integrated VNC-Server. It works, except of one issue: Whenever a user presses "/" (SHIFT+7 on german keyboard layout, the setting for both clients and servers), the x-window emulation enters "?" instead. All other characters (even umlauts, for example) work ok. Do you have any idea where to fix that issue? Thank you very much for your help, Christopher Semturs, from Vienna