I having the exact same problem, no matter what I do to my post in the editor it won’t stay justified. I’ve cleared by cache, wiped my temp Internet files, restarted my browser, and even restarted my computer but no luck.
Did the trouble start an hour or so ago for everyone? I’ve posted justified posts just fine tonight. It’s only in the last hour or so that the justify function (and other formatting according to another post in the forum) has been malfunctioning.