I noticed this in my application and had to go back to the 'simple' demo to track down the issue.
Application.run() is never called in the IceGrid 'simple' python demo if you have a non-zero Ice.Trace.Network property set:
This causes the application to hang in Communicator.initialize(), which is before the call to the overridden run() method.Code:<adapter name="Hello" endpoints="tcp"> <properties><property name="Ice.Trace.Network" value="1"/></properties>
Setting Ice.LogFile fixes it for some reason.

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