I use jquery.colorPicker.min.js
and the complete jquery-ui-1.10.0.custom.min.js
as well as these files that I run through the Google Closure compiler together with my own code:
jquery.base64.js
jquery.cookie.js
jquery.lang.json.js
jquery.multiselect.js
jquery.ui.datepicker-de.js
jquery-ui-timepicker-addon.js
can.observe.backup.js
It will take some time to check if any of the addons and plugins cause the problem with "setter".
My app in its current state runs fine and without errors.
Just the warnings mentioned above are shown from jQuery Migrate.
The "setter" error occurs during the initialization of an Observe. The Observe in question runs fine without the "setter" plugin.
I will test more and reply here.