I just realised the colour and background of tabs, buttons and text in edit post are linked to the options you chose for the live blog's colour and background - in other words, if you set your blog page's feed to white text and make the page opacity low, the buttons in editor ... disappear. What?! That took actual thought, someone looked at that and thought 'yeah, that is the most effective way to work in an editor. Not just static black text on white, but whatever subtle combination the user wanted for their site; but because the background is white and can't be changed, it all disappears. So to make sure you know what button you're clicking (including publish) or what tab you're in, you have to make sure it's readable; but that obviously limits how your on-site blog looks! What?!
And you can't edit with the blog editor, you have to leave, go to blog page, click custom, design, buttons, pick static colours, watch your live blog turn crap, then go to the blog editor and check to see if the buttons are visible. I mean, was there no QC on this before it was released?! Honestly, every day is another 'wtf' working in the new blog. Like it's astonishing how inept it is.