You are either in "last" mode (and everything is working exactly as it should), or you have hit the errors mentioned in the FAQ spoiler in the first post.
Quote:
* In cycle mode (ie. not cover or last):
Q. Get the last thing shown on screen (or a blank screen on FW 2/3/4) in cycle mode, either straight-away or after a few working custom images?
A. One of the files in your screensaver pool upset the Kindle firmware  . That rarely happens on FW 2/3/4 (you're much more likely to see a corrupted image, rather than breaking the whole thing, which is what happens on FW 5.x: once it fails in this way, only a reboot will make the framework try again, even if the next file in the cycle is okay, the framework just appears to give up on screensavers), but on FW 5.x, that means checking the size, format, resolution of each and every file in your pool, to see if it matches the device, and really is a PNG8 (optionally properly dithered down to 16 colors).
Another likely way to trigger that issue is to boot (which also means restart, which is what happens right at the end of an update on FW 5.x) while the device is plugged to something (especially a computer: a wall charger should be fine, but just in case...) . I'm guessing this also impacts the last mode, but the cover mode should be fine (although you're still exposing yourself to all the vanilla things that can go wrong when you boot a Kindle like this ).
TL;DR: Unplug your device.
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