Installed P8 on the other computer which has Windows 7 and its own firewall which is configured to block outgoing traffic. No problems there.

The UI animations are misbehaving though. You know how the buttons highlight and then the effect fades out when you move the pointer away from them. This effect is really slow on the other system (W7, Radeon 4770, latest Catalyst). Doesn't affect usability, but a glitch is a glitch.

I didn't really do anything with it yet though other than confirm that the library is working.