I have an isy99i running 3.3.10 and I have the exact same problem.
While I understand that this may be caused by a change that Apple implemented in iOS7, that does not mean that a workaround on UD's part is impossible. Also, since this affects all users of your product that run iOS devices (which I suspect is a large group of users), I suggest it would be a good idea to see if you can find a solution. We would all greatly appreciate it.
thanks,
-John