thanks. he's likely playing on a flagged save from before he got this mod (as he claims to have it). i found it odd that I'm getting the warning for his cheats and my autosave is disabling; my save may even get flagged if I save in a game, but this I have not tried.Using any cheat in the vanilla game will flag your save. The person you joined obviously doesn't have this mod installed (which removes all that flagging nonsense.)
its like the game is doing a separate check in coop games for if the other person's save is flagged, instead of just flagging (or not, with this mod) when a cheat is actually activated.