I assume this is related to your e-mail:

I'm not sure where to record this, but the problem metadata is explicitly encoding 'rerandomization' and 'showanswer' when they come from defaults; so, the problem metadata editor thinks they've been explicitly set. I can't ferret out where the metadata is being set right now and it seems inconsequential and likely to be completely changed w/ the xblock/xmodule refactoring as well as using split mongo as the backing store.

Why do you think this is specifically related to problems and rerandomization/showanswer? It seems like this could be a general bug. Rerandomize is "always" at the course level (via Advanced Settings); showanswer is "closed" at the course level. We want users to be able to set defaults there, and with this bug, it seems impossible.

Further investigation needs to be done so that inheritance can work.