I've manually changed the form element references to POST and it appeared to be letting me log in successfully, however no matter what credentials I use the same user is always logged in. I attach a URL and two separate login credentials, privately below, to allow you to test that.
I'm wondering if this is all related to the problems I'm also having with the Log Out User and Restrict Access to Page behaviours which I've reported separately here:
I don't understand the "Enable automatic login" section in the Log In User behaviour, however when I uncheck this it produces an error in the behaviour code. Could you explain the Auto-login Check and Remember-me Check sections? I have a suspicion that this might also be contributing to the problems I'm experiencing.
Thank you Ray