On the road to Bosmora just north of Zuldassur Manor, I ran into a small invisible barrier right by the road sign that I my character got caught on for a little bit.
Galvs Thalren (tr_m4_galv_thalren), the boss of the Vys-Ishra Lookout (lower floor), speaks as his greeting "BEGIN TR MAP4 WEST AANTHIRIN WILDERNESS LOCAL GREETINGS"
Most items in Balathren, Workers' Lodge (Aanthirin, just north of Aimrah) are unowned, even weapons and potions. I suggest these be marked as owned to dissuade unimmersive looting.
Description of bug: In Port Telvannis, in the Telvanni Council House Chambers, it appears that any NPC you speak to about "join House Telvanni" will tell you "You have already joined House Telvanni. Your decision is not reversible."
However, it then gives the response options as though you were joining: either 1) "Yes, I'll pay", or 2) "nevermind". Clicking either will repeat the dialogue infinitely.
Severity: It doesn't crash the game per se, but does require loading an earlier save to continue, meaning progress loss can occur.
When you tell crusader location of the lich in Malarnabi Grotto, he swears that he'll meet you in Antechamber in his lair. However, when you appear there, he is simple absent and nowhere to be found, including his previous location, Hlaalu lookout.