If anybody is having troubles when exiting nickel by selecting exit_nickel.png, please report it, so that we can address the problem. Aura HD users are likely candidates. If nothing else, we could at least auto-reboot the reader in order to spare you the bottom up menu.
Edit: I just read in the first post of this thread, that exiting nickel on Aura HD does not work as wished. Therefore, I posted a new version of the startreader.sh for the KBStartMenu_04 version
here.