virtualbox.org

Hello,
if I connect remotely to my computer (Linux/) with a VNC client (Remmina), open Virtualbox, launch a guest (whatever the OS), Virtualbox capture my mouse cursor and I can no more access to my remote computer, the ctrl key does nothing.
I have to kill Virtualbox remotely by SSH to free my cursor.
Someone has the same problem as me? Found a workaround?
Thank you for your help.

Not a generic "Using VirtualBox" question. Moved to "Linux Hosts".

So if you start VirtualBox on the host and then a guest does it actually work properly? ( note I did not say remote )