I've discovered an interesting issue with the Ancient Nord Armor. In 1st person view, when drawing a weapon or sprinting, it appears the camera shifts and blocks my view. I also notice a stretching issue from the hands when I get a clear view in first person. Here are some pictures.
Third Person w/ armor on. No issue.
http://imgur.com/l8tVMZ6
First person, w/ armor on, not moving. No issue.
http://imgur.com/QZTPfAr
First person, w/ armor on, weapon drawn. Clear issue.
http://imgur.com/Szu9UcT
I've noticed that the Ancient Nord Barbarian Armor from Immersive Armors is not affected, despite being built from the same model, but Azhidal's armor from Dragonborn experiences the same issue.
I was asked previously about mods. The only mods that have changed since this started happening are random house mods that I would install, check out, and then uninstall if I didn't like them. I always back up save files if there is any issue.
The other pieces of the armor (helmet, boots, gauntlets) can be worn separately or together with no issue. It appears to be related to the main armor piece.
I did have two texture mods for the ancient nord armor installed. One added pants to the armor (it's cold), while the other fixed a glitch from the base game that showed a hole in the arms in first person.
The pants mod was removed with no change. The arm mod is still in place.
Any ideas or suggestions? Despite it's weaknesses, it's one of my favorite armor sets in the game.