I tried the one from Oblivion Mod Manager (BSA Redirection) and the one from Mod Organizer 2 but no point in telling about MO2 since I cannot run Oblivion with MO2 because it just won't work so I use BSA Redirection from OMM. No, I do not have MaleBodyReplacerV5.esp at all. I tried putting it at the beginning, in the middle, at the end and other places too, none worked so I guess that's not the problem. For now, I left it at the bottom of the load order. And yes, I use the Steam version of the game. I'm not sure, but maybe I think I know of the problem, correct me if I'm wrong, you said to use only the meshes and textures found in the Seamless mod, so I shouldn't be using the meshes and textures from Oblivion Character Overhaul? Only the esp file it comes with, is that it?