Well, I guess with BG it's inevitable that you will get stuck at least once. This time, however, I think I might be stuck for good.
I slaughtered everyone in the bandit camp and fought Tazok, talked to Ender Sai, and (as far as I know) read both letters in the trapped chest. I remember copying them into my journal.
Nevertheless, Chapter 4 never started for me. I'm stuck in Chapter 3.
Is this a bug? Chapter 4 should have started after I beat Tazok, right?
EDIT: So to clarify, It's been so long since I did the Bandit Camp that I can't remember if there was a cutscene that played after I cleared Tazok's tent. The reason I KNOW I'm not in Chapter 4, however, is that my Journal doesn't have a Chapter 4 tab. I can only access tabs for Chapters 1-3. Also, Cloakwood doesn't appear anywhere on the map, even when I travel west from the Friendly Arm.
EDIT 2: I went back to the bandit camp recently after roaming about the world for a LONG while. I found one of the Tazok letters laying on the floor, but I can't find the other one anywhere! I must have carried it around for awhile and then dropped it to make room for more stuff in my inventory. I really have no idea where it is, but now I'm afraid that I need it again to unlock Chapter 4. Did they both need to be in my inventory at the same time or something to start the next chapter? I read every note I pick up, so I'm 90% sure I read both letters before dropping them.
EDIT 3: Any way to force the next chapter to start (through modding, a script, etc)?