Nah, not a matter of being stupid. I don't know how familiar you are with OPL and some people make that mistake.
Try to disable it but I don't think it matters.
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If I were you, I would :
- create another temporary PC user account ;
- do my best to get SMB working from there ;
- when it's working, try to "import" these settings to "Šimon" user account ;
- delete the temporary user account.
I'll try !