I tried to find files in my Data folder that might be culprits but I'm kind of lost.
CBBE AND XCE MOD
So it would seem that it's caused by an unusual mod or some other bug that would perhaps affect a Vanilla save as well. I did some testing removing all my retextures as well as trying w/o XCE enabled and ended up with the same neck seam issue. This image will show how the seam is pretty bad in other lighting conditions/poses most of the time: This image will give you an idea of the neck seam on females: This image will give you an idea of the neck seam on males: Also don't see how it could be a load order issue since only XCE uses an. Just use XCE and combine it with Ethereal Elven Overhaul. My instinct would be that it's a conflict between XCE and body replacer/retextures but doesn't seem to be the case since this was working fine before recently.
CBBE AND XCE MODS
Not sure what mod is causing it, like I said, and am hoping someone knows of a way to check which mods affect heads/necks/etc. I have tried a few body texture replacers that work with vanilla/EVB (including Nuclear Nude even) in an attempt to fix the seams but they aren't going anywhere. I started to have neck seams, which I didn't have before (with all of the above), and I have no idea what caused it. I can't find any info on people having these types of problems using a setup like mine. These problems are widely reported as issues with CBBE and the vanilla Bethesda HD textures. I use XCE and EVB but I also installed the Black Face HD Texture fix even though I don't use Bethesda's HD textures. I use a variety of mods that edit bodies. Continued abuse of our services will cause your IP address to be blocked indefinitely.Hi. Please fill out the CAPTCHA below and then click the button to indicate that you agree to these terms. If you wish to be unblocked, you must agree that you will take immediate steps to rectify this issue. Chaurus Hunters +Feral Foxes And Savage Wolves +XCE - Warpaint and Dirt +SkySight. If you do not understand what is causing this behavior, please contact us here. Plus, it's compatible with xce (though I haven't checked for a unp version yet). If you promise to stop (by clicking the Agree button below), we'll unblock your connection for now, but we will immediately re-block it if we detect additional bad behavior. While I do like both bodies, I think cbbe has more body slides (and options) to choose from.
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CBBE AND XCE SKIN
I'm assuming you're using CBBE vanilla body meshes here (or at least CBBE or UNP), because I'm not certain Mature Skin or NMUBS will work on the vanilla body. Add No More Ugly Bronze Shine 1.4b on top of that.