Nothing we can do for this situation? Not asking anything be done (per se), just WHY WAS IT CHANGED? We want a believable and logical explanation as to why we can no longer activate different game challenges within a marathon nor do we have the ability to deactivate a marathon challenge and choose another within the same marathon. Why can't it be like it was?
If HTML 5 is such a robust language, why cannot the features of the past still be features today?
Now, I will (once again) apologize for my "crass" bluntness in this and past responses - again, just that former military side of me coming out we are simply frustrated being left in the dark with no real viable or logical explanations..