I am using the latest Version of VirtualBox, but have had this problem in previous versions also.
I use a wireless Logitech mouse which works fine in Windows & Linux, but if I try to use it via Virtual Box it will stop moving at certain points on the screen. Say I want to logoff of my Ubuntu VM, sometimes the mouse will not get as far as the logoff button but if I move it around a bit I can get back there. This also happens in a Windows 7 VM & other VM's.
I do have the guest additions installed.
I use another wireless mouse at home & this works fine in VM's. Both mice are being used via a KVM.
Any ideas.
Thanks in advance.