Collection (collection.db) created while kde is running without hald is started can not be read by amarok after hald is started and kde is restarted. Creating a new collection is possible, but then I will loose all the play statistics.
Stopping hald and then restarting kde made amarok read the old collection.db again.

kde-3.5.5
amarok-cvs20061107
hal-0.5.8.1