I've been working with Parallels Desktop 3.0 build 5584 since its release without incident. Suddenly yesterday -- right before an important presentation, natch -- I lost all Internet connectivity from within the VM. I'm running Windows XP Pro SP2 with shared networking under Mac OS X 10.5.1. I went to my Leopard network preference pane and sure enough, the "Parallels NAT" component had a self-assigned 169.x.x.x IP address instead of the usual 10.x.x.x address. I had to uninstall, reboot, and reinstall Parallels to restore normal connectivity from within the VM. Any reason this might have happened, and strategies to avoid it in the future? I had done absolutely nothing unusual with Parallels or my network configuration that might have caused the problem. The problem persisted through several restarts of both my VM and my Mac, using both Ethernet and AirPort on different networks. The only thing that fixed it was uninstalling and reinstalling Parallels. One possible wrinkle: I do occasionally use the Cisco VPN client v.4.9.01.0100 when working from home. I used it without incident with build 5582. Has build 5584 perhaps introduced an incompatibility?