Did you set it to MSM before checking for gmaptz.img? It's in the hidden .System folder which won't show if the device is still set to the factory default mode of MTP, read: [Only registered and activated users can see links. ].

Loly is suggesting that you should reset it if you didn't try that already because it's the First Aid/Immediate Action for any unit acting strangely. 2 ways: (i) With unit fully OFF [not standby], press & hold lower RH corner of screen while powering on and follow on-screen prompt. (ii) With unit on, press 'Speed' field on map page>Press and hold centre of Speedometer for ~6 seconds>Developer Info>scroll down to Non Vol Statistics>Press menu bars in top LH corner>Clear Nonvol.

First backup your favourties if you want to restore them. If you need to know more detail, this info is found on the forum by searching or reading the [Only registered and activated users can see links. ]: [Only registered and activated users can see links. ].