The admin player seems to take substantiallly longer to load then then the engage player. If the player doesn't completely load and the user hits continue, sometimes the end time is not captured. This results in an error. see log http://pastebin.com/2RJHDxze
It's very easy to reproduce, but I doubt users will quickly set the time prior to the player fully loading. Ideally we should disable the keys until the player has the information it needs.
Why is the performance slower on the admin player?