like Brackethouse says it sems to be a localization problem, I tried to change the languge on a virtul machine whit fedora 34 and when the OS language has "." (language as english US, english UK and japanes) as decimal separetor the game works normaly, but when the decimal separetor is "," (languge as spanish and italian) it stop after clicking new game, continue or load button (gc list, option and key binding works normaly)