After one start of the backend, it will no longer boot until the system reboots.

[tau-lex]

After the work is completed, the backend server stops running.
The situation is not corrected by the completion of the accompanying python processes in the Task Manager.
The backend is restarted only after the system is rebooted.
System:
Windows 8.1 x64
Python 3.6.1: Anaconda custom (64 bit)
labnotebook==0.1