It has some of the most hilarious bugs of all time.
Less then hilarious when the same bug would kill my game at the same place ~10 minutes in every time...
I think I know precisely the one you're talking about. Hurrying out of the original temple and skipping across the swamp aaaaaand ... crash.
I know back in the day it was possible to adjust some of the speed sliders in the game to work around this problem. Don't remember the precise solution, but it worked reliably. Dunno if it's still applicable on modern systems.
Agree that IV was probably the most "mature" offering in the series. Haunting, beautiful, tragic.
Though I actually think Trial By Fire was my favourite.