What I’d like to know is why would WP release an update if it has all these issues? Surely they must know it’s messing with a lot of blog owners and their businesses … ya think?
These issues are very isolated and most likely related to a theme or plugin conflict.
@sbmaza I installed the Minimatica theme to test and it is not compatible with 3.5. The javascript the theme is adding to the post edit screen is causing conflicts. I’m going to get the theme author notified and it to the list of 3.5 theme plugin conflicts.
@usmile what theme are you using? Have you tried:
Please disable all plugins and switch to the default theme (TwentyTwelve since 3.5). After making these changes does the problem still occur? If no, re-enable everything one by one to see which component causes the problem.