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Theodore Peirce BaehrTheodore Peirce Baehr 

Unable to update fields in Object Manager because field settings blank on load.

Today, for the first time, I am unable to update fields from the object manager.
On load, the field settings pages are blank, and remain blank. 

Example - were I to visit Setup > Object Manager > Campaign > and click the 'Type' field, the page, on load, remains blank. 
This is true for all fields. 
Tested in both Safari and Chrome. 

Have I switched a disruptive setting somewhere?
Is there a known outtage or disruption to service due to the release of Spring '17? 
Has the boss forgotten to pay a bill? ;)