This is the first time I've heard of SP2 specifically causing problems other than the known issue of the firewall. The first thing I would have suggested is that the firewall was the problem, but you said you disabled it.

So first, triple-check that the firewall really did get disabled.

Next, double check the player's IP address from its front panel.

Then see if you can PING that address from a DOS prompt.

Double check your PC's IP address and make sure it's on the same subnet as the empeg player.

Finally, go through every troubleshooting step listed here.

Then come back here and let us know how you fared, and we'll see what we can do from there.