In some FWs, there was a problem with screen refresh, as soon as nickel was once started. On FW 3.5.0 it works again. If you want to stay on 3.3.0, Lucas provided an executable that refreshes the screen (look for a thread that deals with screen saver for glo).
If you want to show pictures (other than ghostbuster), you should reset the orientation:
Code:
echo 0 > /sys/class/graphics/fb0/rotate
If you want to go back to nickel, reset the orientation again:
Code:
echo 3 > /sys/class/graphics/fb0/rotate
If you want to return to nickel, it is convenient if you save the nickel-screen into a file before you display your own images. If you want to use nickel again, write the saved nickel-screen to fb0, or it wlll be difficult to find the right spots to poke.
Edit:
Here is the post with Lucas executable.