Same here. Just a black screen, in fullscreen mode too, and a small blue circle if GPS is turned on. I've tried both the Google mapping options. I've set as a cache directory "/media/mmc1/maps", it has been created but no files or folders appear into it, even if mapper pops up the "downloading" message when I click here and there into its black screen. I've tried closing and loading the app several times, and rebooting the device: no way, black screen