Slow afternoon at work so I have a few minutes...I have not unfrozen all my apps yet but I have tested these and these are NOT causing the problem. I am using the following to test:
Use home switcher app to go to default home
Press physical key
Providing this list in case anyone else is trying the same thing, so you don't have to duplicate my efforts.
Backup Assistant (all 4 related apps)
V CAST Tones
Verizon Location Agent
Edit: this is annoying Defrosting all apps to determine what default action should be!