So bizarre -- the screensavers hack just disappeared on me! I had done a reboot (not a full reset) and I was back to stock screensavers. The linkss folders were still on my Kindle, so that's not the issue. I just re-installed the hack and that update ran successfully. Rather odd and surprising. I hope I'll get my screensavers back now.
For reference, I'm on 5.3 and ran the jailbreak + bridge before updating to 5.3
edited to add: after the re-install of the linkss bin, I'm back to my custom screensavers.
Last edited by sparrowlight; 11-29-2012 at 11:56 AM.