Weird Login Issue

Hi

I am building a new yii site and have run into an unusual login issue - the login fails to complete - whether I use the bog-standard demo/demo admin/admin version of login or a DB-based one

What happens is that when I hit the login button both login and password fields turn light green, but then revert to white and I stay at the login page, and I am not logged in…

If I enter an incorrect password, I get the validation message for incorrect login or password.

It was working yesterday. The only change was that I used gii to set up CRUD for one of my tables (not a table at all involved with users or authentication…)

I don’t see any errors in the application log.

Any idea why this might be happening?