Willerz2
I have mobile substrate on my iPhone 5 and I have never used sb settings nor have I downloaded it.
Wonder if it came down with winter board !
So the OP should have mobile substrate even if they don't have the sb settings tweak !
Confusion resolved.
To the OP keep trying pressing the top button and home button until the apple logo appears and then press the volume up button which puts you in safe mode.
This should disable all your tweaks. Go into Cydia and uninstall the problem tweak.