unable to save or create courses in coursepress

Hello
My teachers can not create new pages and save them. I have tested this .. what happens when I click on save (within the course units - I am trying to create a new page) it takes a long time to save.. and finally it stops.. and all the text I have typed disappears - not only is it not saving but it is deleting everything I have created from the page...

Teachers are also unable to preview any pages.. when trying to view.. it takes forever and eventually we get a the following message:
502
The page request was canceled because it took too long to complete

Please look into this.. I have given access to the site.
The first issue is new and is a major problem... the second issue is old I have included a link to that discussion.. If you could please check on the status that would be great. thanks
https://premium.wpmudev.org/forums/topic/502-errors-when-trying-to-view-course-pages#post-1076941
Thanks
Brenda