Just for clarification, is the bug you're referencing the "Use the saw blade next to the elevator to "hop" and stay in the arena" one?
If so, all sorts of unintentional things start happening afterwards.
I ran into the "Completing" endless mode bug during testing. It prevents your current score from posting to the board, so it's no fun at all. - As far as I'm aware, I've filed various versions of what you've experienced on Asana already, but it's always useful to know how many people run into any given issue.
-Thanks for the report!