Membership problems with database HUGE problem!!!

Hi there!

Tonight I made an update to Wordpress, changed version 4.2.0 to 4.2.1 – and found a problem with membership. In the dashboard I can still see the amount of memberships, but when I go to the whole list I see NOTHING anymore. This is a huge problem, due to the fact that I haven't got any control of my memberships anymore.

So what is this? It seems that – when it comes to the core function – the plugin still works, people can buy a membership and open the paywall. But somehow the view to the database was destroyed. Can this be an issue with refreshing the Wordpress database after the update? Did I destroy something?????

Please help, thank in advance!!!!!