(libgpod) synced files missing from iPod interface

Using libgpod, I have written a small C program[1] to copy a given mp3
to an iPod.
This works, actually -- tracks are present in the itdb after unmounting and
remounting the ipod. However, when I look on the iPod itself, the tracks are
nowhere to be found. The only indication of error is the following message:

** (process:27501): CRITICAL **: itdb_splr_validate: assertion `at !=
ITDB_SPLAT_UNKNOWN' failed

>From digging around in the source code of libgpod, it looks like all this means
is that the library encountered a weird smart playlist.

What is going on here?

[1]:  http://github.com/rhdoenges/cpod

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