Hi, I have also had this problem.
Metaslider was working fine last week but today when I click on the ‘home’ option to add some new photos to the slideshow on our hompage I get taken to a white page with a message saying “There has been a critical error on this website. ?Please check your site admin email inbox for instructions.”.
I have yet to receive an email with instructions.
This thread has been reassuring to see someone else is having the same issue – If I try the fix of re-installing metaslider, will I lose the slideshows I currently have active on the site?
Thank you