After upgrading to Jessie yesterday (Sat 22nd Nov 2014), Rhythmbox had problems
with rhythmdb.xml and showed import errors for every file, seemingly due to
tracking which partition the files were on.

Reimporting the library and comparing the old and new rhythmdb.xml showed that
the old one included lines for each entry of the form:
      <mountpoint>file:///srv</mountpoint>
which were missing in the new one. Removing these lines from the original
allowed Rhythmbox to load the file.

The /srv partition is still mounted as before the upgrade, so I doubt it is
anything to do with that.

Apologies if this is an already handled case; the upgrade bombed out with an
initramfs error so I don't know if this would have been OK normally.