Your problem seems to be caused by the newer SDK that you are now using.
One possibility would be to go back to the older version that worked, but there is another solution described in the article : Troubleshooting Windows Phone 8 Emulator problems :
- Run the
Hyper-V Manager, and click on theVirtual Switch Manager. - If there is no entry resembling
Windows Phone Emulator Internal Switch, click onNew Virtual Switch, chooseInternaland thenCreate Virtual Switch. Create a new entry calledWindows Phone Emulator Internal Switchand then click on OK - this will create the emulator switch. - Open the
Network and Sharing Centerby right clicking on your Network icon in the system tray or accessing it via the Control Panel. Then click onChange adapter settings. You will see a list of your network adapters, including the one we have just created. - Right-click on the adapter, and select Properties.
- Untick all the items except for:
- Client for Microsoft Networks
- QoS Packet Scheduler
- File and Printer Sharing for Microsoft Networks
- Microsoft LLDP Protocol Driver
- Link-Layer Topology Discovery Mapper I/O Driver
- Link-Layer Topology Discovery Responder
- Internet Protocol Version 6 (TCP/IPv6)
- Internet Protocol Version 4 (TCP/IPv4)
- Click on OK.
- Reboot
You may need to disable your VMware adapters or you may not. If you still have problems, you can check what network adapter your emulator is using by running Hyper-V Manager. You can see the list of virtual machines running. Click on one of the emulators, and then at the bottom, click on the Networking tab, and you can see which network adapter your emulator is using.