E-mail problems

I've been having trouble w/ the little "Send" arrow in the upper RH hand corner of an email. When I try to email myself a Midi file of a song, I press the Send arrow, & nothing happens, except the arrow gets dim when I press it. The email doesn't get sent.

E-mailing sometimes works when I close the program & re-open it, or even turn off my iPad & re-start, but not always. I've tried sending to a different email address, but that doesn't solve it. I've got the latest update of iRealPro & of iOS 8.

Any ideas?