We have upgraded from 6.2 GA6 CE to 6.1 GA1EE( with latest patch portal-121-6210). Everything else is fine but we cannot simply add new pages.
When user load the "Site Pages" tab of the from control panel. We see the error in browser console that
"Uncaught TypeError: Cannot read property 'compareTo' of null(...)"
Investigating it a bit further, error is coming from aui-overlay-mask-deprecated.js
In the above code function parameter 'v' is coming as null.
Because of this error user can't do anything, if user click on 'Public Pages', a popup with no design appears and in console i see 'Uncaught ReferenceError: Liferay is not defined'
Something is really not right after upgrading.