Unhappy [Q][Issue?] Towelroot & Safestrap Issue?

I'm not even really sure if this is related to each other or not.

I was OTA'd to NB1 back when I got my phone, so I updated to NC1, and rooted with Towelroot, installed SuperSU, installed SafeStrap 3.72

Now, I've had another i337 as well, and noticed it with that too, after having to ODIN to stock NB1.

It seems that I can no longer make a SafeStrap backup anymore... post Towelroot'ing. Where as, when I did the downgrade to (crippled) MK2, rooted via Saferoot, got back up to NC1 ROM, with SafeStrap, I could.

Has anyone seen this issue? Are they even related? Is there anyway to fix it?
Rockin' it from my o7th S5 Edition v1.5.1 Galaxy S4 I337 Rom

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