I am updated to the current version, but am now getting a Javascript error stating that the login field is required when trying to login (using Rainlab.User). It's a bit of a PITA as I can't test logged in pages without basically detaching the plugin...

Anyone have thoughts on best way to resolve? (remove plugin and re-add?... stop running updates... other?)

A couple updates ago, one of the user fields became required... like "login" or "username" whatever it was... not just email. Check in your backend that all your frontend users have that field filled out. I've just been putting the email address in there as well.

yeah... went through and did this. Added login field (the migration failed on my side due to another issue), and seeded it with the email address field. Just reaching for thoughts on why it still throws this error, and how to fix it.