Unfortunately I think the biggest problem is that it seems cookies are shared across instances of UBot, or multiple instances of a compiled bot, or even different compiled bots. So even if there's a workaround for clearing the cookies, it would end up clearing the cookies of any other instances of a bot as well. Cookies are also shared if you use the "in new browser" command, which seems a little silly and kind of defeats the purpose of that command at least if you're doing something that requires logging into an account.