Login Loop

[sunshinelock]

I'm running 4.11

This was working fine until this afternoon when I went to check something.

I get the screen asking for username and password. I click "Login". The next screen gives me main screen:

Error in form verification
Main Menu
Customers
Items
Vendors
Manual
Logout
ERROR Message Report : This form was not submitted with a correct ID

This error message is not out of the ordinary.

But the problem is the next click. If I click any of the 4 menu items (not manual or logout) I get redirected to the login screen. It's an endless loop. This is all I am allowed to do.