DC logical functions are now disabled when using GTK3.
Apparently using XOR was still having an effect.
Use regular black pen with no logical funciton instead.
#!/bin/bash
# Run python example throug command line, and check usual output
coproc setsid $BEREMIZPYTHONPATH $BEREMIZPATH/Beremiz_cli.py -k --project-home $BEREMIZPATH/exemples/python build transfer run;