A couple of custom scripts that are part of my workflow don't work in the new CC; MultiExporter.jsx and Sprite CSS Generator.jsx.
some UI features got broken when we went from CS6 to CC, users mentioned them, complained about them, got frustrated about them and lived with them...maybe something else went south with the newer release, sorry I don't have CC to test and find out possible workarounds.
It looks like this might have been a system issue or conflict of some sort; I uninstalled AI CC2013 and AI CC2014 as well clearing out all prefs and artifact files and folders. Then did a fresh install of CC2014 an was able to use all my legacy scripts with no problem.
Thanks for posting the solution.