How do I fix kernel connection problem?

[Theblindrain]

I have recently worked on a project in jupyter (3.6.2 anaconda, windows 7). For some reason, at one point I started getting "Kernel starting, please wait" message which would not go away. Then I realized there is this message in the console:

handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler)) ValueError: signal only works in main thread

I have not updated the browser. I tried different browsers, makes no difference. The only thing I did just before was updating pip directly in jupyter. I restarted my computer many times, no luck. Any ideas?