Is this on every pagetype? every page? Do you have any custom property?
Can you look in developer tools in Chrome and see if there are any 500's coming back from any requests in the network tab?
Checked developer tools and no 500 is coming for any request.
It looks like HTML is being returned instead of JS which could be causing the error. Is the site properly licenced too?
Can you try manually opening some of the requests that are served for the UI? Any issues should be visible when you view the contents.
I have upgraded to version 11. All pages are fine but on one custom page i am not able to view All Properties mode. It is seemed like clicked but still showing block mode.
After upgrading CMS to 10.8 from 7.5 , everything is working fine except CMS edit mode is not loading. When we are trying to open "All Properties" (edit-mode) for updating any content from CMS , it is not loading and giving some JS errors:
Uncaught SyntaxError: Unexpected token < epi.cms.contentediting.editors.selectioneditor.js:1 >
Uncaught SyntaxError: Unexpected token < epi.cms.contentediting.editors.contentareaeditor.js:1 > > >