Hey,

I just learned about the pool events and with their help I can see that
MediaCore will retrieves multiple connections from the pool but not all
connections are properly returned by the end of the request...

In the end the culprit was a bad ToscaWidgets form:
CheckBoxList('groups', label_text=N_('Groups'),
  options=Group.custom_groups(...).all),

That somehow got a new connection from the pool at class load time (= when
MediaCore was started) but the connection was never returned.

Just writing these posts somehow help understanding/solving the problem -
though I am sorry that I didn't find out until after sending the message.

fs

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