I'm sure someone has mentioned it; but the new Preview Panes are not that helpful.
On IE, which I ust use at work, - the Preview, for longer posts with quotes usually, writes over the previous posts , making it illegible.
At home, I thought "aha! Safari will be better" , it is not.
So I post and then edit straight after, it's quicker and easier to see. Prefer the old Preview method.
Of course in a typical mimic, of taking your car to the garage , and asking a mechanic to try and find a fault, and the car is perfect for him - this post is very cleanly showing up with Preview - bah humbug!