I just wanted to report a possible quest-chain breaking bug that happened to me yesterday: in the Region of Terror mod for the EET. Apparently, while Having Sandrah in the party, and defeating Errtu, to save regis, as soon as I enter the second level of the cave where Errtu is, I got a dialogue from Regis telling me "I'll be joining drizzt. Goodbye. ( even if I just entered the second level of the cave, and still had to defeat Errtu). Quest goes normally till I defeat him, then, regis is not there. Had the same issue with Bruenor appearing out of no where in the Ultima Master's house, before I started the quest to save regis, telling me the very same thing, and being stuck. I left the quest aside for the moment, loaded a previous save yesterday.
Am I doomed, or can it be fixed?