[This may be out of date]
This didn't start working until i added the squid line.
skinr[second_sidebar]
skinr[second_sidebar][features]
skinr[second_sidebar][features][]
skinr[second_sidebar][features][] = squid
skinr[second_sidebar][features][] = block
(Squid is not added to the features array, but it's the only thing that makes block show up. And if 'block' is put first, then it's only squid that is added to the array of features.)
Resolution
having
skinr[second_sidebar]
produces fuzz