Usually problems with the designer is to incorrect initialization javascript library.
For the designer is required:
- JQuery
- JQuery UI
- JQuery.treeTable
- KineticJS v 5
For the diagnosis troubles You need open console browser (usually opened by pressing F12 button).
Typically, the error associated with:
1. Error: "Object does not support property or method 'dialog'"
You don't initialize library JqueryUI or you have included JqueryUI twice.
2. Error: "Unhandled exception at line 5, column ....... in ...../Scripts/workflowdesigner.min.js"
You are using an incompatible version of jQuery.
Please use this scripts from: jquery.js and jquery-ui.
3. Problems with mouse control in Chrome
In some cases AdBloсk blocks some mouse events.
To resolve the need to disable AdBloсk and restart your browser.
4. Error: "Object doesn't support property or method 'addEventListener'" in InternetExplorer
Follow this instructions: http://social.technet.microsoft.com/wiki/contents/articles/24276.sharepoint-2013-troubleshooting-object-doesn-t-support-property-or-method-addeventlistener-or-getattribute.aspx
5. Error: "0x... - JavaScript runtime error: Unspecified error." from kinetic.js library
This happens when it can not download images. Check that the path to images that is configured for the Designer object at imagefolder: '/images/' property exists and contains images fro the Designer.