When we generate the PegaAPI documentation for category 'Application' the output is incorrect:  

"newRow": {
	"$ref": "/definition/NewRow"
},

The output should be generated as:

"newRow": {
	"$ref": "#/definitions/NewRow"
},

Most likely that this generation isn't the root cause and actually is a manifestation of a bug deeper in the core Pega-UI code. I'm not sure what the further impact is regarding the UI.