I have the same issue. Swapped Lae'zel out right before the 'devil' vs paladins quest and ever since I haven't been able to talk to her in camp. I can target her with spells and attacks, but can't initiate dialogue (even when she has the yellow exclamation mark). Tried killing and res'ing her, but resurrection scrolls list her as "invalid target" (but "speak with dead" works) and if I go to the skeleton dude to revive her he doesn't even register that she's dead so I don't get the option.
I had been holding off on doing the Celebration until I explored more, but I'll try that next. Will report back if it fixes the bug.
