User name changed - login failed

[shawn_a]

Probably because it redirects, you would need a die(); after those lines

Are you using salts ?

We provide this user file for resolving login lockouts.
https://github.com/GetSimpleCMS/GS_unit_...s/user.xml
but you will have to disable your login salt if set in gsconfig

I am also not sure how you "changed" the username, as it is a readonly field.