I'm sure you already know the author is busy, as he's tryin to have someone take over his work. Since you know how to turn on and off mods. Why don't you look at your complete list of mods and see which ones do the same kinds of thing as cultural overhaul?

It's a bit tedious, but the quickest and least tedious way to figure out which mods are conflicting is to turn everything except cultural overhaul. Then, if you have 20 mods total. You would turn on the first 10 and look for a conflict. If there is a conflict- out of the first 10 mods turn off the second 5 mods and look for a conflict. If there is no conflict you know the problem is with the first 5 mods you have subscribed to. keep narrowing it down until you've found all the conflicts in the first 10 mods. Then repeat the process with the last 10 mods you've subscribed to.

This is the only thing that can be done, and only you the player can do it. Mod authors are engaged in their own work, and not many of them spend time looking for compatibility with every other mod that has been made for stellaris.

Thank you, thats what I have been trying to do.

I apologies if it came across that I was expecting an answer from the author, but really, I would have just wanted one from anyone who had an idea.

Thanks

Uh, I hope this isn't too late, but I had a similar issue with a mod very similar to this one, and it turned out to be the UI Overhaul 1080p mod that I was using - the UI mod overwrote the ethics selection screen such that, even though the ethics were actually there in the game, they didn't show up on the wheel, like what you're describing here. Took me ages to figure out :P.

Hope that helps.