Yes I spoke a bit too soon. I'm now agreeing with kOnsl
Here's my history. Since the 3.5 install today I've had problems with:
Quick Edit, Edit Permalink, Going to Text view, Insert/Edit Link, Add Media link not working, Help not working, Screen options not working.
Since adding in define('CONCATENATE_SCRIPTS', false );
Quick Edit now works, Going to Text view works, Insert/Edit Link almost works - see below, Add Media link works, Help is working,
Screen options are working.
Adding a link into a post - Need to click twice on Insert/Edit link
On second click screen becomes tinted. Form then occurs down at the bottom left of screen. The form works for the most part.
The Cancel button doesn't work. The Add Link button works but leaves the screen in tinted presentation. Although the link has been placed I can only access the post by navigating away and opening it again - with autosave the link has been saved. So it is right around the houses on this bit.