virtualbox 3.0.51r22226: some quirks

[Andriy Gapon]

Just to check if the following issues are mine local or if they are known ones.

1. Host+Del combination doesn't sent Ctrl+Alt+Del to a guest, this used to work
correctly before.
2. Permanent shared directories disappear after VirtualBox restart.
3. VirtualBox guest clipboard driver freezes on attempts to copy something from
host to guest; guest to host works OK.

Otherwise, VirtualBox works great for me.
Thank you!

-- 
Andriy Gapon