I've added in a bunch of mods, but it's odd that just those 2 show this. Can someone take a glance at those and see? If it's just me, it's likely a conflict.

Most likely I've missed a patch when I merged the PBR into the main distro. Those were the only two engines that had specific PBR textures (which were removed), but the patches are likely still pointing to those now removed texture files.

Cool. Just making sure I didn't manage to screw up my install.