Audio is stuttering since upgrade

[tuqqer]

So appreciate these ideas!

Totally had forgotten to check another user account. Got hopeful there for a second, but even logging into other accounts (both an Admin and a Guest account), the stuttering was there. Which tells me this is a deep level glitch in the update. Been looking all day for other files to delete. I think I've reached the end.

Also opened Audio Midi Setup Utility. Some interesting info in the Info preference (see attached), but nothing I could interpret.