Kdenlive, doesn't read clips created on timeline

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http://chakra-project.org – Hello,I have never used Kdenlive or others apps like that, so I don't know if it is a bug or if I don't used it correctly...My problem is, I am trying to follow this tutorial (sorry, it's in french...).So, I have several clips and I drag and drop these clips on timeline. Now, I would like to see the result on "clip monitor", so I push "space bar", (no effects), or I click on play on "monitor clip", it plays the original clip, no the clip created on timeline. Is it normal ?Thank you.EDIT : Even if I placed the cursor on the timeiline at the begining, (HowTos)