Version:            (using KDE KDE 3.3.1)
Installed from:    Gentoo Packages
Compiler:          gcc version 3.3.4 20040623 (Gentoo Linux 3.3.4-r1, ssp-3.3.2-2, pie-8.7.6) 
OS:                Linux

when a music is playing, and you click next or the music ends and juk switch to another music, if there was a change in the collection list ( applying/unnapplying a search filter), juk crashes. 

During the crash, the whole system gets painfully slow. Both physical and swap memory reach the top, then juk closes and everything comes back to normality.

cases:
music playing, apply search filter, next => crash
music playing, apply search filter, music ends, another start => crash

music playing, apply search filter,stop music, click on music ou press play => don't crash

I haven't tried anything with playlists, just collection list.