When trying to use the breadcrumb block of Blockify with Aurora, no breadcrumb was displayed. Apparently theme() is called incorrectly in aurora_preprocess_block(). It seems that such a bug should be quite visible and there should be an existing issue for it, but I didn't really find any other explanations than a bug for the problem... Attached is a patch for the block functionality.
Also it seems that using the breadcrumb block requires an undocumented, unselectable theme setting. Is there a reason for this?