Cannot Log In after update

Any time i try to update the plugin the site doesn’t let anyone log in. I end up having to use the link from my web host’s auto log in mechanism to get back in and then restore the site back to the state it was in right before the update.

I’ve tested without any other plugins active and after updating every plugin other than ‘WP User Frontend’. ‘WP User Frontend Pro – business’ is not the problem itself, but the core plugin is. It will not update past version 3.2.0 without this being a problem. Also redirection doesn’t work anymore, but that might be fixed once an update actually works.

I’ve opened this ticket on the site as well since i have the paid version, but the problem, as i said, is with the core plugin, not the pro version, so i’m opening a support thread here as well.