This same thing happens to me as well but in the library.
After reinsering the track manually into the library the message "Output window
was closed" appears under "Properties" with a red ("no-entry") sign next to it.
It seems that closing the output window causes a fatal error?
Running rhythmb
*** This bug is a duplicate of bug 677042 ***
https://bugs.launchpad.net/bugs/677042
** This bug has been marked a duplicate of bug 677042
rhythmbox removes song from library when external visualization is closed
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Des