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@Floob: Thank you for the fast reply.
The save states work without issues (tested with autosave on exit, autoload on start of the rom).
But the srm files are either not saved correctly or not being loaded correctly. I finished various stages and tested with SMW and Donkey Kong Country. Tomorrow I’ll try and diff the srm files before and after finishing a stage to check if something has been written.
Is there a log file I can check for potential errors ?

*cough* finishing stages does not mean that SMW saves…
You have to beat a castle,switch palace, or beat a ghost house…