Tracks won't email

[arsenogenics]

I have DAW multitrack on both ipad mini and iphone and until recently had no problems.
For apparently no reason the email function is not working.
I go to "sharing" and pick M4a and "send".
email opens. Track appears to be there. When i receive it there is nothing attached.
There was a recent upgrade to io7 which I downloaded just before on the ipad and I was wondering if that was the reason.
Mixdown doesn't work either.
I have not upgraded the ios7 on my iphone yet and it still appears to work perfectly. Is this an issue?

[pwnified]

That sounds really strange. When you say mixdown doesn't work either, what is the error? Does it pop up the dialog box saying "Mixdown Complete"?