Hey theme gurus! I took my first stab at creating a child theme using the instructions for 3.2 and later. However, I am using these instructions on 4.0 RC1.
Was going along pretty well until I got to the part about bringing in the settings pages etc - I followed the duplicating settings from Boost part as I wanted my own settings to be applied, not Boosts. I got the theme to still work after that but every change broke it until I did a purge all caches...I then added a couple of css changes which I have working very well in the boost theme and they worked for a while. Then the site broke (lost all css) and I never could get it back.
I am guessing the settings parts have changed enough that something crashed when I followed the instructions for older versions. I am going to start again from scratch and try and be more careful about seeing where it started going sideways - but if anyone has thought about how 4.0 is going to affect child theme creation and wants to share any hints, that would be awesome!!