After reading this thread: http://forums.gpsreview.net/viewtopic.php?t=25652 I decided that I wasn't going to send in my GPS for a new one just because of a keyboard issue.
What I did to resolve the problem:
1. Backed up my data.
2. Hard reset.
3. Reinstalled firmware/maps/additional updates.
4. Imported my data.
5. Copied the folder "keyboards" back onto the device.
To be honest, I screwed up backing up/importing my data. However, my keyboard now works!
I have included a set of keyboards that came with my Garmin Nuvi 1450. Just extract the folder and you're good to go.