Cisco IOS-XR Up Arrow Not Working

I found that on my ASR9000 router every time I hit the up arrow I got the following errors:

Invalid number(-48) sent as ASCII value to command-line process from VTY/TTY, refreshing prompt.
Invalid number(-95) sent as ASCII value to command-line process from VTY/TTY, refreshing prompt.

It seems that Cisco recommends setting the stop bits to 2, which can be done with:

configure
line console stopbits 2
commit

I then set my console port to use 2 stop bits.

After that, everything was right as rain!