Version:           2.4-GIT (using KDE 4.6.0) 
OS:                Linux

When trying to fill the playlist window with an APG, nothing happens. The APG symbols are greyed out and Amarok tells me that it is generating a new playlist. The constraints (all songs in between 1979 and 1990) aren't bad and have worked in previous versions.

 It doesn't help to press the cancel symbol in the progress bar. The bar just disappears, but the APG is still not accessible...

Here is the debug output:
amarok: [APG::ConstraintSolver] Constraint Solver quality factor: 0.4 
amarok: [APG::ConstraintSolver] New ConstraintSolver with serial number 1623301183 
amarok: [APG::ConstraintNode] new constraint node at 0x38a8040 with parent at 0x1f6c670 
amarok: BEGIN: ConstraintTypes::TrackSpreader::TrackSpreader(ConstraintNode*) 
amarok: END__: ConstraintTypes::TrackSpreader::TrackSpreader(ConstraintNode*) [Took: 0s] 
amarok: [APG::ConstraintSolver] Running ConstraintSolver 1623301183 
amarok: [Constraint::TrackSpreader] audit final satisfaction 1 
amarok: [Constraint::TagMatch] "Everyday Is Like Sunday" true 
amarok: [Constraint::TagMatch] "Goodbye, Horses" true 
amarok: [Constraint::TagMatch] "la bebete" true 
amarok: [Constraint::TagMatch] "Vanini vanillée" true 
amarok: [Constraint::TagMatch] "Heart" true 
amarok: [Constraint::TagMatch] "Girl You Know It's True" true 
amarok: [Constraint::TagMatch] "Headhunter" true 
amarok: [Constraint::TagMatch] "Deanna" true 
amarok: [Constraint::TagMatch] "The Mercy Seat" true 
amarok: [Constraint::TagMatch] "Paranoimia" true 
amarok: [Constraint::TagMatch] "Eye of a needle" true 
amarok: [Constraint::TagMatch] "Legs" true 
amarok: [Constraint::TagMatch] "Slip of the tongue" true 
amarok: [Constraint::TagMatch] "Backbeat" true 
amarok: [Constraint::TagMatch] "Instruments of darkness" true 
amarok: [Constraint::TagMatch] "Peter Gunn (featuring Duane Eddy)" true 
amarok: [Constraint::TagMatch] "Camilla" true 
amarok: [Constraint::TagMatch] "Chameleon's dish" true 
amarok: [Constraint::TagMatch] "Beatback" true 
amarok: [Constraint::TagMatch] "Peter Gunn (extended version)" true 
amarok: [Constraint::TagMatch] "Opus 4" true 
amarok: [Constraint::TagMatch] "Un Amor" true 
amarok: [Constraint::TagMatch] "Tu Quieres Volver" true 
amarok: [Constraint::TagMatch] "Stadt Im Niemandsland" true 
amarok: [Constraint::TagMatch] "Fortsetzung Folgt" true 
amarok: [Constraint::TagMatch] "Shanghai" true 
amarok: [Constraint::TagMatch] "Op Dä Deckel Vum Clown" true 
amarok: [Constraint::TagMatch] "Rääts Un Links Vum Bahndamm" true 
amarok: [Constraint::TagMatch] "Sandino" true 
amarok: [Constraint::TagMatch] "Dat Däät Joot" true 
amarok: [Constraint::TagMatch] "Everyday Is Like Sunday" true 
amarok: [Constraint::TagMatch] "Goodbye, Horses" true 
amarok: [Constraint::TagMatch] "la bebete" true 
amarok: [Constraint::TagMatch] "Vanini vanillée" true 
amarok: [Constraint::TagMatch] "Heart" true 
amarok: [Constraint::TagMatch] "Girl You Know It's True" true 
amarok: [Constraint::TagMatch] "Headhunter" true 
amarok: [Constraint::TagMatch] "Deanna" true 
amarok: [Constraint::TagMatch] "The Mercy Seat" true 
amarok: [Constraint::TagMatch] "Paranoimia" true 
amarok: [Constraint::TagMatch] "Eye of a needle" true 
amarok: [Constraint::TagMatch] "Legs" true 
amarok: [Constraint::TagMatch] "Slip of the tongue" true 
amarok: [Constraint::TagMatch] "Backbeat" true 
amarok: [Constraint::TagMatch] "Instruments of darkness" true 
amarok: [Constraint::TagMatch] "Peter Gunn (featuring Duane Eddy)" true 
amarok: [Constraint::TagMatch] "Camilla" true 
amarok: [Constraint::TagMatch] "Chameleon's dish" true 
amarok: [Constraint::TagMatch] "Beatback" true 
amarok: [Constraint::TagMatch] "Peter Gunn (extended version)" true 
amarok: [Constraint::TagMatch] "Opus 4" true 
amarok: [Constraint::TagMatch] "Un Amor" true 
amarok: [Constraint::TagMatch] "Tu Quieres Volver" true 
amarok: [Constraint::TagMatch] "Stadt Im Niemandsland" true 
amarok: [Constraint::TagMatch] "Fortsetzung Folgt" true 
amarok: [Constraint::TagMatch] "Shanghai" true 
amarok: [Constraint::TagMatch] "Op Dä Deckel Vum Clown" true 
amarok: [Constraint::TagMatch] "Rääts Un Links Vum Bahndamm" true 
amarok: [Constraint::TagMatch] "Sandino" true 
amarok: [Constraint::TagMatch] "Dat Däät Joot" true 
amarok: [APG::ConstraintSolver] ConstraintSolver 1623301183 finished with satisfaction 1 
Object::connect: No such signal APG::ConstraintSolver::endProgressOperation( QObject * )
Object::connect: No such signal APG::ConstraintSolver::totalSteps( int )

[...]
amarok: BEGIN: void ProgressBar::cancel() 
amarok:   cancelling operation:  "Eine neue Wiedergabeliste wird erstellt" 
amarok: END__: void ProgressBar::cancel() [Took: 0.019s] 



Reproducible: Always

Steps to Reproduce:
Select any APG and click on apply.

Actual Results:  
playlist generation freezes, although the rest of the program keep working (also interactively).

Expected Results:  
the playlist should be generated and the playlist should be filled. and than the AGP should be accessible again.

OS: Linux (x86_64) release 2.6.37.6-0.5-desktop
Compiler: gcc