About resizing: My monitor has a viewport of 1680x874, and I have the editor using all that width (at least today, when I found this problem). I did resize down clicking the middle button top right corner (don't know the name for it in English, the one between minimize and maximize). When I had it in this middle size, all the tools came back in the default toolbar, but when using my own toolbar I I had to maximize the window again, and then all the icons were back (that may be because my toolbar is wider than the default one).
Mind you, after the resizing down and up again, when I have all the icons back, I can click on 'code' and all is well, both toolbars.
Well, I would call this a bug.
Inger, Norway
My work in progress:
Components for Site Designer and the HTML Editor: https://mock-up.coffeecup.com