Given my luck, this is likely something peculiar to me. I made a fresh install of BG2, ToB, the ToB patch and Baldurdash (non-Weidu). I then installed my usual mods, nothing earth shattering--pretty much everything hosted here along with a few other NPC mods. I started a new game, cutscene, blah blah, then Imoen came to rescue me. Well, after I got out of the cage, I tried using the Solo With A Party AI script on my PC only, not Immy. The 'party has gained an item' message flashed, whereupon the game crashed to the desktop. Okay, no problem. I figured something I'd installed wasn't compatible. So I deleted my override and save folders as well as weidu.log, chitin.key and dialog.tlk and replaced them with the clean install I keep for backups. I installed *only* the AI script with the same result.
Is this just my luck, or should I refrain from turning on the script until I'm out of Irenicus' playpen? I'd really like to give this a try; I've been wanting for a while to play a solo game, but I can't not have Kelsey with me and I'd miss the character interactions.
Anyway, thanks for your advice.