Activation crashed my admin

UPDATE: The problem wasn’t the plugin but my security settings. The plugin’s creator helped me solve the problem, and it’s working great now!

I installed this plugin and it installed perfectly, but once I hit activate, my entire admin site went totally blank. Nothing but a blank screen as far as the eye could see! I eventually had to go into my file manager and manually remove the plugin so that I could regain access to my back-end, and that solved the problem, but this didn’t activate properly for me.