When I first undertook to become a werewolf underneath the Skyforge in Whiterun, the transformation didn't fully "take."

Same thing happened with the vampire initiation/training session at Serena's dad's palace.

The symptom is the same: one part of the program thinks I'm either a werewolf or a vampire, while another part doesn't get the message. In werewolf mode I still had my armor, while in normal mode I was all crouched down running around in my breach cloth. (LOL!)

Same thing in vampire mode--I still had my armor, and when asked to cast the Vampire Lord spell, it wouldn't work. I selected it in the menu, but the spell never got to my hands, which still had my normal spells active. I got out of that situation with a save game.

The werewolf glitch took place before the vampire one, and I made the mistake of using the console to remove my werewolf mode change spell instead of going back to an earlier saved game. Now I've moved on, playing normally, but when later seeking to become a vampire, the program still thought I was a werewolf. People sometimes remark about hair in my ears. Still, the vampire glitch symptom was almost identical.

I'm wondering if this glitch has something to do with the "being-a-werewolf-and-vampire-at-the-same-time" glitch.

The werewolf bug manifested in version 1.7 something. I had the release Dawngaurd DLC loaded, too, but not started. The vampire glitch happened in 1.8.165.

(I also had the release version of Hearthfire loaded both times, and that bugged out too--not sure whether it was before the werewolf glitch or not--causing me to lose my house and everything in it, but that's another story.)