Default Nandroid backup completely dysfunctional

So I finally took a shot at flashing a custom ROM ( from stock to unified 4.4 ROM). When I attempted to revert back to stock nandroid backup, everything went completely haywire. The radio was disabled and I got recurring process close errors. All I could do was battery pull and flash back to the ROM.

What do I need to make my nandroid recovery work correctly? I'm on CWM if that matters.