Outlook mail wont send messages on icon w/ win10

Odd problem but since I upgraded my icon to win10, Verizon's release, I often cannot send email's. It happens only when I am replyng to a message. I can compose the message. Tap send and nothing happens. Also backspace does nothing when this happens. New messages work fine however only replies present the issue. It happens on both my email accounts as well

Any ideas?

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