Rockstar Games has implemented new anti-cheat software to GTA Online "as part of our ongoing efforts to protect our community," and in doing so, has rendered mod menus unusable, including one popular, long-running one which appears to be saying goodbye, at least for now.
BattlEye Anti-Cheat was rolled out in yesterday's GTA 5 update. As the patch notes explain, it's possible to disable it in the Rockstar Games Launcher if you're just heading into Story Mode, as ultimately, it's there to try and protect online players from cheaters. However, there's apparently no current workaround for those who want to use mod menus such as the popular Kiddion's Modest Menu while playing GTA Online.
