Symptoms

Editing a view is causing the designer to "spin" indefinitely.
 

Diagnoses

This was an issue where upgrading from 4.6.9.24 > 4.6.11 > SF 4.6.11.18 did not overwrite a jscript file on the files system.
File: "C:Program Files (x86)K2 blackpearlK2 smartforms DesignerViewsScriptsourcecode.forms.designers.view.ajaxcall.js"
 

Resolution

There was an AJAX call in the jscript that was no longer needed in a function. This was causing the issue.
Function: "_getSmartObjectListMethodsResult: function (data, textStatus)"
AJAX call: _ajaxCall.View._setListMethodStateForDetailsStep(false)

After commenting the call out, all was well again. This issue was addressed in rollup SF 44.6.11.19. If you run into this issue, please contact K2 support for the latest SF rollup.