I hadn't realized there were log files. Took a look and found this entry which seems to indicate the problem:
2018-01-25 07:10:47,124 - CRITICAL - cura.CrashHandler.__init__ [62]: An uncaught exception has occurred!
2018-01-25 07:10:47,125 - CRITICAL - cura.CrashHandler.__init__ [65]: Traceback (most recent call last):
2018-01-25 07:10:47,126 - CRITICAL - cura.CrashHandler.__init__ [65]: File "C:\Program Files\Ultimaker Cura 3.1\plugins\UM3NetworkPrinting\DiscoverUM3Action.py", line 60, in restartDiscovery
2018-01-25 07:10:47,127 - CRITICAL - cura.CrashHandler.__init__ [65]: self._network_plugin.startDiscovery()
2018-01-25 07:10:47,128 - CRITICAL - cura.CrashHandler.__init__ [65]: File "C:\Program Files\Ultimaker Cura 3.1\plugins\UM3NetworkPrinting\NetworkPrinterOutputDevicePlugin.py", line 87, in startDiscovery
2018-01-25 07:10:47,129 - CRITICAL - cura.CrashHandler.__init__ [65]: self._zero_conf = Zeroconf()
2018-01-25 07:10:47,129 - CRITICAL - cura.CrashHandler.__init__ [65]: File "zeroconf.py", line 1523, in __init__
2018-01-25 07:10:47,130 - CRITICAL - cura.CrashHandler.__init__ [65]: OSError: [WinError 10042] An unknown, invalid, or unsupported option or level was specified in a getsockopt or setsockopt call
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nallath 1,124
Could you share logs?
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