I need help debuging one issue before filing a bug report.

If I try to organize mp3 file(s), amarok always ends with this error:
Sorry, one file could not be organized

(It's "one file" even when more files are organized)

This is printed to terminal for each organized file:
amarok: ERROR: : couldn't create slave : Unable to create io-slave:
klauncher said: Unkown protocol ''.

This is not a permission issue.

I have strace and mysql query logs, but I can't find anythig suspicious. I can post them here, or some parts of them (strace log has 12MB).

I started to get this error few months ago on Kubuntu 7.10, the system was reinstalled to 8.04, but the problem persisted. Collection DB is mysql, sound system xine, all stock from kubuntu.

Any suggestion how to find out more are wellcome.