I hope I am right when thinking :
1) "Your Kindle is updating" was a result of Amazon automatically downloading the v3.3 update to your Kindle while it was connected via 3G or WiFi.
2) It was unsuccessful because you have the ENABLE_HACK_UPDATES which will refuse Amazon signed updates and only succeed when accepting JailBreak's key signed updates
3) Nothing is broken but you are still at 3.1. Yes, you can still install 3.3 to benefit from the additional (not many but still useful) features (like personal document synchronized and archived in the Amazon cloud).
4) No need to re-jailbreak. Remove ENABLE_HACK_UPDATES and restart from "menu settings" / "menu restart". Then download v3.3 from Amazon, copy it to the USB drive, and "menu settings / menu restart" again.
5) Since you only have the screen savers installed, the update should go through successfully as no file system has been modified prior to your uptade (e.g. the CRC for files to update will thus match).
6) You can re-add ENABLE_HACK_UPDATES and "menu settings / menu restart" to prevent further future Amazon updates.
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