Matlab engine freezes at MatlabEngi​ne::waitFo​rMatlab when trying to connect.

We are trying to use the matlab engine in our QT C++ application, through a PythonQT console. Normal python commands work from within the console, however when we attempt to connect to Matlab engine, it hangs at the function call MatlabEnginge::waitForMATLAB (see line 6 of tack trace, in attachment). We have a Matlab engine running and its engine is shared by calling

matlab.engine.shareEngine

On the PythonQT console, we connect to it by

eng = matlab.engine.connect_matlab('XXXX')

This results in the engine(?) freezing. I am attaching the stack trace as an attachment.

Note: We dont have a problem connecting to matlab engine directly from a generic python terminal. We only encounter this problem when we access it from within the PythonQT terminal.

Any help or pointers is appreciated :)

NT

[Rob Campbell]

In my hands this behavior happens if a connection to the named session already exists. I can't as yet find a way for testing whether a session of this name already is connected.