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.
@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.