Originally Posted by windsorclarenc
I'm guessing because I'm rooted? That and I heard if you don't wipe Google Wallet settings before flashing a new ROM it can cause issues. I did this when I flashed Charmeleon ROM. But i forgot to when I restored my viperROM nandroid backup.
No need to guess, you are correct.
By clicking the "learn more" link below the error message, it states:
"Some users may disable important security mechanisms in order to gain system-level 'root' access to their phone. We strongly discourage doing so if you plan to use GW. We are unable to support devices w/ unauthorized OS's as the security layers of the devices may be limited."
As to your second issue, you may or may not have a problem using GW if you didn't save your info on the nandroid. Mobile GW is device specific when you log in, so by not resetting prior to wipe or flash, it's going to store information that may not be the same on your next ROM and cause issues. Too early to tell whether this can be fixed, but check out the Nexus forums for some tales of GW woe.