Are you on 3889? I am having the same issues. I tried to upgrade a month ago and had the same issues. I use malemods, femalemods, mpclothes, eup, and one I made called lscso. From my research, I found that 3889 supports only 3 YMT per male and female, where my old game version supported 4. So just using the 3 without lscso, I was able to get my game working a month ago, still had some minor issues but it would not load with some changes, so I abandoned it because of time. Yesterday, I installed 3889, and can only get one EUP folder to work, it crashes the character in lspdfr and gives ASI errors that memory is corrupted. I do not know what changed on this but I can only get eup to work now. You can however, this is hard to do, use the mp_2023 and mp_2024 and put eup in there and alter the YMT with an editor. This may be what I have to do.