Seems I’ve come across a similar bug.
I can use x2go to connect to a Fedora 22 workstation running XFCE. While using the small keayboard on my iMac, and using a large Apple keayboard and the built in macbook pro keyboard, everything works fine. Keys work as expected, for the most part.
While in the XFCE session, I fire up VirtualBox running a Windows 7 VM. Trying to use this, is where my keyboard no longer works at all. Looks like the same mappings as in post #47.
Am unsure how to proceed to work around. May just end up using VirtualBox built in remote connection for access to it.
Bryan Berndt bryanb@bryanb.net