If you are using Safestrap 3.65 (latest version as of now) on a Droid 4 and you are flashing KitKat you get a /osh mount error...
Uninstall Safestrap Recovery, then uninstall Safestrap. Download Safestrap 3.11 and install with that. I no longer get the /osh error when flashing KitKat.
I did it from a reflashed Stock image so I have no idea if you will be able to recover any ROM-Slots you may have had so do this at your own risk.
I used [SCRIPT] DROID 4 Utility XT894 Jellybean -- Windows + Mac + Linux (All In One!) for the entire reflashing process and Safestrap install. I love this utility!!! Thanks mattlgroff for this utility!!! http://forum.xda-developers.com/show....php?t=2207384