After Update, Login fail

N2D’s reply doesn’t work w/ nginx-based installs.

So is there any solution? I renamed plugin folder and I can log in via /wp-admin , but as soon as i rename and activate plugin again – same story, no admin panel. When I delete plugin over ftp, my .htaccess not changing. Maybe to delete rules manually and install plugin again? But there is so much in my .htaccess …. if anyone have better idea i would be grateful.
Regards!

This is infuriating. My custom login screen now attaches my 404 code to the bottom of the page. What a mess!

I followed the full protocol as described by North2Doug, no improvement. Same error across all browsers as well.

Knew this “upgrade” was going to be a disaster.