Viktor’s fix worked for me.
I started with all the deleting and reinstalling the plug-in, but issues would come back.
Then I removed a bunch of stuff from the .htaccess file. This fixed many issues with losing the admin login, but not everything.
Followed Viktors advice and went into the PHPMyAdmin and deleted the tables with itsec in title. Reactivated the plug-in, made a few changes in the settings just to get a good “save” action invoked. Now everything works as expected. Even the “hide backend” feature. I haven’t tried turning back on the “away” feature.
I’ve used other security plug-ins in the past, but I kept coming back to this one. I am going to stick with them as long as possible.
You cant expect upgrades to go seamlessly for gods sake. Especially with a tool like this that has settings saved all over and its main goal is to lock down content and hide the keys. Seems to me most (if not all) of these issues have to do with lingering data from old installs. I agree there should be better communication or documentation from the developer though. But hey its free. Nobody should complain about free.