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There is a widespread issue affecting many Marketo users at the moment. Marketo has been working on a fix for ~2 hours at this point. You can see more discussion in this thread:
You can see Marketo's note about it here:
Issues with Marketo Navigation Tree
UPDATE: The tree service has been reverted to the previous release and is performing better, but some customers are continuing to experience issues. We are still investigating the root cause of this problem. ALERT: Some customers may be experiencing problems loading the Marketo navigation tree. Our team is investigating and will provide more information as soon as it is available.
There does not appear to be any data loss, only a display issue. It's tough to navigate within the application, but once this is resolved, all data should still exist.
THANK YOU! I worried about this all night, since I can only log in from the office. Everything seems to be back now. That was downright traumatic!