[Problem]When I start using Virtualbox for a while I always have problems with copy and paste. All pasted text ends up as: ŸŸ. I can still c/p in the Windows XP inside the Virtualbox.
[Solution]I was using VirtualBoX 1.5.2 but the guest additions of my virtual machine were 1.5.0.
I reinstalled the guest additions from the 1.5.2 image and the problem was solved.