Comment 2 for bug 500059

I have the exact same issue, except I am running it on a 2.26GHz + 4GB RAM machine (Kubuntu 9.10). The only thing I can think it to be is the fact that the file I am trying to play is 1.7GB. However I also tried it with a ~500MB file and still got some jitter / freezing. I love the software, but if I can't use it properly, then I may have to move on :(. I can also confirm that changing the desktop effects makes no difference. Maybe it's one of the dependencies not behaving right, I'm not sure. Kdenlive appears to have a lot of bugs when I Google it, but this is the first bug Ive come across that actually addresses my exact problem. Lastly, I have also had the same issue when using Ubuntu 9.10 with Gnome.