Alrighty. I figured it out.
The problem I've reported is not at global level, but only with 1 game. Which pointed me to hiscore.dat v190 and
modification that shall be done for this game. So, the game that shows error is ONLY pc_1942. Rest of games show no errors - tested all
I've removed this string:
;****** turn FREEPLAY on (in dipswitch settings) before playing ******
... and no errors
Eventually You may modify these to correct values and release fixed hiscore.dat