[Zubersoft]

In order to get around that problem, you have to restart your Android device. It's a known problem with the MTP connection between PCs and Android tablets. If you add any files on the Android device after the USB connection has been made to the PC, the only way to get those files to show up on the PC through Windows Explorer is to reboot the Android device. Unplugging the USB cable and plugging it back in is not enough.

As far as your new tablet not being able to see the .msb fie, where did you store the file on the tablet?

Mike