I have had several emails about this recently

If your using DNGDR & Azura does not show up after the finish of the main quest it is because you have a mod loaded after DNDGR that puts Azura back in the vanilla location ( which is up above where the facility cavern is placed in DNGDR and out of gameplay )

Good to know. I was actually about to use GDR for the first time. Any idea what specific mods are out there that do this?

any mod that might touch the facility cavern or Azura best bet is to have DN-GDRv1.esp (or DNGDRv1_NOM.esp if using nom) load last or as close to as possible.