If spellbook of healing aura is used when player is standing over something interactible (a chest, or a sarcophagus - tested) player is unable to move until he picks up the item he is standing over. Feels like "healing aura" is impassible.
I've also once saw a random "stuck" after used a scroll of return on low health, but I couldn't reproduce it.
Found the reason behind the second variant of "stuck" - player was hexed and after using "Scroll of return" couldn't move until the hex weared off.
The second is technically no bug. You can't walk avout holy ground (sanctuary) as long you yre hexed.
The first case on the other hand sounds a bit strange to me. I'kl investigate this.
About the first one - yes, healing aura is completely inpassable (neither by player, nor by enemies). The only way is to wait it wear off.
The use of healing aura and return spells now removes the hexed buff. This should fix most of the issues.