I have this issue too - get it sorted immediately!! I can't get to my content - and as a premium user I don't expect to have to keep trying to workout what is wrong with these ever-more terrible version of evernote! SORT IT OUT!
Same issue here: I pay for this service and I can't even get to my notes from the mac application... so what is the point in using it? Maybe time to move to Joplin unless this gets resolved VERY QUICKLY.