I took some time today to test my app Mappu against Sproutcore master (I hope master is the right branch to check).
I meant to test it before the latest IRC meeting, but other things came up.
Good news first: the app does not break and it actually feels snappier. The panes look different in background color and
shadow, but that's ok. I was using the defaults anyway.
Lots of developer warnings in the console, expecially with regards to animation callbacks and timings.
Now the broccoli: there is a segmented view in the toolbar where the position of the first button is wrong. This seems to happen only on buttons
without icons because another segmented view with icons in all buttons looks ok (see the Livelli button in the second image).

It seems that the cause for the mis-alignment is a wrong font-size, but I can't find the exact change that broke it.
Picker panes appear in the wrong place (the one in the image should have appeared below the 'Livelli' button) and are missing the pointer anchor and the
contents in the top toolbar (a couple of radio buttons and buttons).
Also note that an html entity (à) appears escaped in another segmented view in the bottom right corner.

In the next few days I will try to look into these issues, but I shall make no promises.