Membership Plugin Causes Site to Crash

I created many pages on my site (more than 50) and now the Membership plugin settings seem to be preventing me from accessing any of my pages, including the WP admin area. If I totally disable the plugin, I can view my entire site without restriction. I disabled and then removed the plugin and then reinstalled it. This didn’t fix the problem. How can I load and activate the plugin from scratch without the apparent page restrictions?