I upgraded early this morning to 2.7.1. After upgrading, some of my buttons are missing from the edit post page.
I use the wysywig button manager version 0.5 and have additional buttons (like code) available. In addition, I have other plugins activated, including WP Poll, and that had inserted a button.
Before upgrading, the "code" button was there, and is gone now. In addition I notice that the split/etended entry button is gone; I'm not sure about other buttons, only the ones I've specifically noticed, there could be more. I disabled the plugin wondering if there was now a conflict with that plugin. The split/etended button is still gone. So is the Poll button.
I'm wondering if anyone else is having a problem with missing buttons or the mentioned plugins.