Unfortunately, the AI monsters are starting to revert back to the old way of webbing and beguiling the wrong units in 1.4 (I also have the Dead DLC). I've had spiders web a unit after it was already successfully webbed by another earlier, and the targeting seems off again--often the ranged casters are getting beguiled in my party. Hopefully this can get fixed. I also see that Caravans are getting withered again.
I can confirm Fezziwig's spider combat AI miscues. Double webs... hmm.. stackable would be kinda cool. And I had a group of Panca Archers beguiled last night.
Also getting caravans withered and tremored...
Edit: Oh btw, no undead DLC for me yet. Playing with abob101's Demons and Wizards mod, Parrotmath's armored militia, snaking and swamp tiles mods.