My copy of AquaMail Pro auto-updated today to v.1.3.6. I tried to send an e-mail pasting in the same closing I always use, and I got nothing. I figured the clipboard had been cleared, so I hand-typed it, copied it, and attempted to paste it in again. Still nothing. I switched to a different app, pasted the clipboard text, and got exactly what I expected, so the copy function is clearly working; that just leaves paste. This worked fine yesterday, before the update.
Incidentally, I close e-mails differently depending upon the recipient, so I don't want to use a .sig.