Looking again at CsoundPython.cpp, it seems right that there
was a memory access exception with csound5GUI. This bit of
code, which is responsible for it, is suspect:

 csoundDestroy(csound);
 csound = cppSound->getCsound();
 csoundSetHostData(csound, csoundGetHostData(*csound_));
 csoundSetMessageCallback(csound,
                            
&CsoundGUIConsole::messageCallback_Thread);

It appears that by destroy 'csound' we destroy *csound_,
which then
causes the csoundSet...() API calls to fail.

I don't really understand the code and the reasons why you
have to
create a new instance and destroy the old one. It appears
that is
because you want the derived object rather than the base,
which is
fine, but it is crashing here.

If we on the other hand do not destroy the old instance,
then it's
OK. There is no crash. I don't really want to go modifying
code that
I don't fully understand, so I'll leave it up to the authors
to fix it,
now that we know where the problem lies.

Best regards,

Victor


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