On the 'receive' tab, if I hit tab to go to the 'amount' field, enter a number, hit tab to go to the 'message' field, then shift-tab back to the 'amount' field, the amount is selected. If I hit backspace, the amount is deleted. If I then hit tab again, the number I previously entered reappears in the 'amount' field.
It says at the top that all fields are optional, but once I've specified an amount I don't see a way of changing my mind and leaving it blank.
