It was an accident. I made a svn update, backed up my files, then merged the whole thing by using wp-admin/upgrade.php . Hey! guy, I forgot to backup my database! Orz....
Actually I can recover the db from an auto-backup made yesterday. Yes, I am such a backup intensive nut. And I am investigating the upgrade-*.php in order to make a script. But I hope there would be one set of downgrade script form developers. I am far from professional or carefully.
You shall let people regret and step back with ease, and people would have the gut to go on.
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What made me panic, is about the admin panel layout. If you can read traditional Chinese, you may find my comment on blog http://blog.bencrox.info/?p=119 .
In brief, I find the Dynamic sideboxes, about categories and etc., collapsed. I cannot edit things governed by those boxes. It might be my own browser's problem, so please check it at your own risk, or forget it.
I dont like the textbox being so "dynamic and parsed" as well. Pressing backspace made it scrolled too much... But as a matter of taste, others wont be bothered as I do.