Confluence 2.7.1, Theme Builder b.29.
Ready to push builder layouts globally on our instance of Confluence. After doing a "bulk update" all spaces were set to builder, layout simple... however on revisiting the page many of the themes say global theme (ok) or Top and Left Navigation (my old jar theme I was modifying).
hmm. the misbehaving space had the builder theme applied to it on most pages, but going into manage space took me back to the old theme - without of course the layout control options!
Manually selecting the adaptavist theme (changing from global) refreshed everything ok and I was able to switch to the builder layout.
Everything seems ok now - this may just be something crunky in my confluence install but I thought i'd just quickly document the situation here in case it comes up for someone else, and will post updates if things change.
fyi - sometimes the top save button here is non-responsive for me latest 2.x of Ffox.