Version:           2.3.0 (using KDE 4.4.2)
Installed from:    openSUSE RPMs

1) I have dynamic mode enabled, but I moved 2 whole directories to that playlist
2) While playing a song from that directory, I moved the directory elsewhere (still within the collection)
3) After the song ended, Amarok didn't proceed to the next track (collection scan was still in motion)
4) I double-clicked on the next track - Amarok now skipped all the tracks that were from the same directory, and some more, even though these "some" files were not in the same directory.
5) I double-clicked on the first track that was skipped and that was not in the moved directory - it started playing OK. After the track ended, Amarok didn't proceed with the next track
6) I double-clicked on the next track and it started playing OK. However, Amarok doesn't now proceed to the next track after playing one.

Very obscure use-case, but there was something wrong at that time with playlist handling. Restarting Amarok corrected it and now (the same) playlist is progressed again.