Same here mikegomak. Everything is completely gone. Looks fine from the front end. But cannot change anything at all, editor doesn’t work, nothing.
I think people are going to need a bit more info in order to be able to help you here.
-What URL are you trying to access that’s now blank? /wp-admin/ ?
-Did any cpanel / apache / etc. updates happen on the server overnight? Maybe an update to a required library failed.
-Does your hosting provider have backups? You could restore in the worst case scenario.
-Please define “everything” from the limited info above it sounds like you can get to the editor – do you mean the post editer – therefor the control panel and other parts are working fine and you just can’t edit a post using the WYSIWYG editor? Or do you mean the whole control panel is gone and /wp-admin/ is a blank page?