Appreciate everyone's comments on this thread. Found working solution to the fact that I could not access Internal Storage and/or SC-card from USB connected computer.
dancedroid
Removed all Motorola Drivers from computer (Device Manager - add/remove all Moto).
Reboot Computer (previous removal and or "repairs" to drivers I may not have rebooted each time).
Wiped cache-partition on XT907 (possibly this may have been the missing procedure ...)
Reboot XT907.
Reconnect XT907 to computer via USB and Re-Install Motorola Device Drivers (Motorola Device Manager).
Now when I connect via USB, I have directory tree access to Device Internal Storage & SD-card.
Then just a simple change to not open the annoying Backup Assistant popup upon every connection, and I think things are on track.
http://www.droidforums.net/forum/droid-razr-m/232381-backup-assistant-plus-annoying-popup.html
Developer Options & USB debugging (must be ON & Checked) along with (MPT) as noted previously in this thread.
Thanks again to those who confirmed it works for them, to push me to find solution for my issue (corrupted Drivers from initial OTA JB push).
dancedroid
Removed all Motorola Drivers from computer (Device Manager - add/remove all Moto).
Reboot Computer (previous removal and or "repairs" to drivers I may not have rebooted each time).
Wiped cache-partition on XT907 (possibly this may have been the missing procedure ...)
Reboot XT907.
Reconnect XT907 to computer via USB and Re-Install Motorola Device Drivers (Motorola Device Manager).
Now when I connect via USB, I have directory tree access to Device Internal Storage & SD-card.
Then just a simple change to not open the annoying Backup Assistant popup upon every connection, and I think things are on track.
http://www.droidforums.net/forum/droid-razr-m/232381-backup-assistant-plus-annoying-popup.html
Developer Options & USB debugging (must be ON & Checked) along with (MPT) as noted previously in this thread.
Thanks again to those who confirmed it works for them, to push me to find solution for my issue (corrupted Drivers from initial OTA JB push).