Upgraded to 3.1.2 this morning from 3.0.10. Everything works fine, but the download page says:
Note: After upgrading VirtualBox it is recommended to upgrade the guest additions as well.
Does the upgrade of guest additions happen automatically? The main Virtual Box window on my install shows that VBoxGuestAdditions.iso is still mounted to the CD/DVD drive, just as it was before I upgraded. What more, if anything do I need to do to "upgrade the guest additions as well", as the download page suggests?