Settings not saving

After upgrading to latest WP, settings in SST are erased. When I reset they do not stay – just go back to nothing. No check boxes kept, no icons or counters show up on the site – nada. Hope you can fix this asap – Thanks!

https://wordpress.org/plugins/social-sharing-toolkit/