NPCs have stopped idle chatting with each other. This is most noticeable in the inns, it's actually pretty creepy. As Gimli would say, "You'll find more cheer in a graveyard."

NPCs do still greet each other sometimes, and make comments to my character when I pass them in the streets. There is still some pvssyr, but nothing like it was last night...

I was just in the Winking Skeever earlier, and no one said a word the whole time I was in there (like 2 game hours).

My most likely candidate (most recently installed mod) to be the culprit is Inconsequential NPCs. Inconsequential NPCs has Dialog Topic edits...

But, disabling Inconsequential NPCs in my load list doesn't resolve the issue.

Anybody any good at discerning conflicts in the dialogs, and figuring out what is going on?

EDIT:

Oh, yeah...

I also installed Become a Bard recently.... it also has edits to Skyrim.esm's dialog tree....