The same bug is happening. Whenever I try going into play a different song besides "Too Slow" it doesn't process and it disables me from doing anything else but pressing enter on the different song I unlocked. If this makes sense.
Edit: The executable file is doing the same thing. But in order to play those other songs, I have to start from the beginning act 1 to go to act 3 triple trouble or the other song. (Reuploaded comment to make sure you got this)