ODPM by calyps (http://www.nexusmods.com/skyrim/mods/17707/?) is an essential mod for many , me included
however , it changes the body slot that dragon priest masks use

this isn't a problem in most cases
however , when used in conjunction with SoS , that uses the same body slot (52) , the result is invisible dragon priest masks

this mod fixes the issue , by editing the meshes and plugin from ODPM to use body slot 44 instead
the main version of the mod is a modified and fixed version of the standard ODPM masks
for those who wish to use Variant 1 masks , or for those who use a different body slot , I have also included a tutorial I've written , that describes the steps I used to make this mod , so you should easily be able to recreate it yourself

the original mod is still required . after you install ODPM , just overwrite it with my files (only the edited files are included , so if you fail to get the original mod , you'll have several missing meshes in your game)

hope this helps you , and enjoy the game :)