Comment # 5 on bug 1206457 from Michael Chang

(In reply to Fritz Hudnut from comment #4)
> Seems like I once again spoke "too soon" on this grub2 problem, as once
> again grub errors out via "Moklist not found" . . . even though yesterday
> the machine booted to grub just fine.

The "Moklist not found" is very unlikely a grub error and most likely shim.

> Today, with no recent upgrades run through . . . it boots to grub rescue?? 
> Seems like it's very difficult for openSUSE to keep a stable grub file??  In
> this case the machine's only grub listing is Leap 5.5.

The problem is not unstable grub but your MBP system seems to boot invalid efi
entry from time to time in that firmware and linux efi boot manager is more
related.