Front end fails to represent correctly boxes

Context

Sometimes my front end misrepresents some output typically involving associations. For instance

EmbedCode[CloudDeploy["hello, world"]] 

should produce

enter image description here

according to the documentation but in fact yields

EmbeddingObject[Association[EnvironmentName->HTML,CodeSection->Association[Content->,Title->Automatic,Filename->cloudembed.html],CloudObject->CloudObject(https://www.wolframcloud.com/obj/2f2939a8-cd27-4c9a-99a2-c8ea44db36a6)]]

Question

How to fix this?