H4 campaign crashing with 4 player co-op

[LvnarNeko]

Played all the campaigns* with 4 player co-op seamlessly as advertised by the author. However, Halo 4 always crashes when trying to do 4 player local co-op. In the other games, we could load into the games with the 4 player split screen set up during the menu select screen. H4 required us to load into the game proper before we loaded in additional players, otherwise the game would not load or the other players would not show up.

Going straight to 4 players crashes the game immediately with an error message saying, "Fatal Error!" with no additional information. In the first mission, after being released from the hatch by Cortana, we can add players one at a time and the game would play perfectly fine. But, as soon as we add a fourth person, the game crashes with the error.

Is this a known issue? Is there something specific we need to do to fix this or work around it? Is there a setting I might have enabled without knowing that's causing the crash?

*Notable exceptions being the H1A and H2A campaigns with updated graphics. We did play through the two campaigns with original graphics seamlessly.

[LvnarNeko]

Not entirely relevant to the main issue, but both H1A and H2A with updated graphics would load in the other players and make the split screen dividers, but the game itself would not split the screen accordingly. We could still move and shoot with the other players, but they would have no screen unless we flipped back to original graphics which instantly restored everyone's cameras. Is this an issue with the way the anniversary editions were made or an issue with the mod? Thanks!

[WinterSquire]

Are you using modded map? Cause there is a known issue when you play modded map and there is a chance that the game will access invalid memory using function BinkGoto.

[LvnarNeko]

We are playing with no other mods, just yours.

[WinterSquire]

Which version did you use? Have you tried the dev build? This is the first time I heard someone would crash the game while adding player 4 in h4. If the dev build doesn't work, then you have to debug the game by yourself and then tell me where the exception point is (in [module + offset] format), as I can't reproduce this issue. Btw, the anniversary splitscreen graphics issue have been answered here.