Problems cutting audio & multiple audio tracks

Hi all,

I'm trying to cut some audio tracks with Kdenlive 0.7.8 but I'm having some trouble.

I've started creating some video tutorials so I've made a quite long desktop capture with RecordMyDesktop. Only somewhere along the line I made something that apparently slowed down the video recording but not the audio, so my audio gets out of sync at a very precise point in time. Therefore my original idea was to edit the file, separate audio and video (no problem there), cut the audio, and push the second part just a few seconds away from the 1st one. So I have two tracks, one video one audio, with the audio separated in two parts.

That's where problems start:

1) After pushing the second part away (which visually looks fine), I keep hearing the original soundtrack - just like if I had not cut it at all.
2) If I move the 2d part of the audio to a new audio track, I don't hear it either. I still keep hearing the original one. If I mute the original sound track, I hear nothing - although I believe I should be hearing the newly created track.

I must be doing something wrong... I just can't figure out what!

Any idea?

Thanks.

Seb.