Details pane suddenly stopped working

%3CLINGO-SUB%20id%3D%22lingo-sub-1006458%22%20slang%3D%22en-US%22%3EDetails%20pane%20suddenly%20stopped%20working%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-1006458%22%20slang%3D%22en-US%22%3E%3CP%3EHello%2C%26nbsp%3B%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EI'm%20working%20with%20a%20customer%20and%20they%20today%20started%20to%20experience%20a%20problem%20with%20the%20details%20pane%20in%20a%20document%20library.%20When%20I%20select%20a%20document%20in%20the%20library%20and%20try%20to%20open%20i%20get%20the%20following%20message%26nbsp%3B%3C%2FP%3E%3CDIV%20class%3D%22od-DetailsPane-PrimaryPane-wrapper%22%3E%3CDIV%20class%3D%22od-DetailsPane-PrimaryPane%22%3E%3CDIV%20class%3D%22od-DetailsPane-PrimaryPane-body%22%3E%3CDIV%20class%3D%22od-ParentHeightWatcher%22%3E%3CDIV%3E%3CDIV%20class%3D%22od-DetailsPane-LegacySection%22%3E%3CDIV%3E%3CDIV%20class%3D%22InfoPane-section%20InfoPaneSection--properties%20is-expanded%20no-arrow%22%3E%3CDIV%20class%3D%22InfoPane-sectionContent%22%3E%3CDIV%20class%3D%22spo-Properties-sectionNotification%22%3E%3CDIV%20class%3D%22od-SectionNotification%22%3E%3CDIV%20class%3D%22od-SectionNotification-text%22%3E%3CEM%3ESorry%2C%20properties%20can%20not%20be%20displayed%2C%20having%20error%3A%20Error%20during%20serialization%20or%20deserialization%20using%20the%20JSON%20JavaScriptSerializer.%20The%20length%20of%20the%20string%20exceeds%20the%20value%20set%20on%20the%20maxJsonLength%20property..%3C%2FEM%3E%3C%2FDIV%3E%3C%2FDIV%3E%3C%2FDIV%3E%3C%2FDIV%3E%3C%2FDIV%3E%3C%2FDIV%3E%3C%2FDIV%3E%3C%2FDIV%3E%3C%2FDIV%3E%3C%2FDIV%3E%3C%2FDIV%3E%3C%2FDIV%3E%3CDIV%20class%3D%22od-DetailsPane-SecondaryPane-wrapper%22%3E%3CDIV%20class%3D%22od-DetailsPane-SecondaryPane%22%3E%3CDIV%3E%3CDIV%3E%3CBR%20%2F%3EI%20have%20tried%20to%20replicate%20the%20error%20by%20making%20a%20copy%20of%20the%20Library%20%2Fmetadata%20and%20everything%20to%20a%20new%20tenant%20but%20I%20cant%20seem%20to%20replicate%20the%20problem.%3C%2FDIV%3E%3CDIV%3E%26nbsp%3B%3C%2FDIV%3E%3CDIV%3EThe%20only%20difference%20I%20can%20seem%20to%20find%20is%20that%20the%20tenant%20that%20are%20experiencing%20the%20problem%20has%20a%20new%20feture%20on%20the%20details%20pane%20called%20show%2Fhide%20collumns%20beneth%20the%20properties.%26nbsp%3B%3C%2FDIV%3E%3CDIV%3E%26nbsp%3B%3C%2FDIV%3E%3CDIV%3EHas%20there%20been%20a%20release%20of%20new%20fetures%20recently%3F%20Grabbing%20for%20any%20information%20I%20can%20get.%3C%2FDIV%3E%3CDIV%3E%26nbsp%3B%3C%2FDIV%3E%3CDIV%3EIt's%20a%20Sharepoint%20Online%20environment.%3C%2FDIV%3E%3C%2FDIV%3E%3C%2FDIV%3E%3C%2FDIV%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-1006458%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3EDocument%20Library%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3EFiles%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3ESharePoint%20Online%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E
New Contributor

Hello, 

 

I'm working with a customer and they today started to experience a problem with the details pane in a document library. When I select a document in the library and try to open i get the following message 

Sorry, properties can not be displayed, having error: Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property..

I have tried to replicate the error by making a copy of the Library /metadata and everything to a new tenant but I cant seem to replicate the problem.
 
The only difference I can seem to find is that the tenant that are experiencing the problem has a new feture on the details pane called show/hide collumns beneth the properties. 
 
Has there been a release of new fetures recently? Grabbing for any information I can get.
 
It's a Sharepoint Online environment.
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