I'm pretty sure that the error you're seeing is not a cause for concern. We all see it on occasion. I believe that it has to do with starting an mp3 from the middle.

I feel very confident in saying that it's not a problem with my preinit (I need to update it to do some other stuff), as if it were failing, your empeg wouldn't get very far into the boot at all (I'd stop right after it said ``init'').

That only leaves the Viewer app that differs. See if you can FTP to your empeg and remove the appropriate file (there's probably only one) inside /etc/preinit.d/ and then reboot.