Sun texture

Has anyone else had issues installing REX sun textures? For whatever reason, no matter which set I  select, the only thing that shows up in the sim is a slight glow. Yes, the box is checked under setting in REX. The only way I even see that is when I run the time preview. I have even tried copying over the textures and .cfg files manually, and still get nothing. I have adjusted the size of the sun to see if that makes a difference and it doesn't Not sure what else to do. I have looked on REX forum and googled, but doesn't seem like anyone else is having a problem. Would be nice to see the sun instead of just having sky textures out there.