I noticed this myself then checked code for Bot::SaveBotGroup and noticed botGroupId always returns 0 then the script exits, so it never gets to the part where it saves the groupmembers.
To fix this bug replace: (in latest source as of 1/24/15)
	Code:
	if(botGroupId == 0)
        return;
 with this:
	Code:
	botGroupId = GetBotGroupIdByBotGroupName(botGroupName.c_str(), errorMessage);
if(botGroupId == 0)
        return;
 In bot.cpp>Bot::SaveBotGroup
Now it will properly check the groupid, then save the members, tested and it works.