Am having the same problem that I losing connection after you assign IP to a Vlan. But lets try: Lets say if your switch ip that you connect to is: 192.168.1.254 which is default ip for switch. And you try for example assign 10.0.1.1 to your 2nd vlan and lost connection, you can try to change your ip on your PC to 10.0.1.2-254(choose an ip in range of 2-254) if you can connect with 10.0.1.2 try to check if your vlan been assign.
"Notice" if your 10.0.1.1 vlan port to GE1, you need to connect your cable from pc to GE1 on the switch.
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