Hi Ralph, it's as I thought:
The VM log says
:DVM:20211:meta Connection { {encoding "ISO-8859-15"} ...
which is the wrong encoding
it should be ISO-8859-2 which is made is for polish.
That means your VM side settings are not correct.
Please check LANG,
and
% locale -a
on your system, if you have installed the polish language tables.
If you open the GDC debug console you see immediately in the 2nd line (meta) if your setting is correct when restarting the application.
BTW which system you are running on?
Kind Regards, Leo