from 9.10 Karmic I have problems with video editing. In Karmic were problems with Pulseaudio, but now I have another speciality. I think thats not only Kdenlive problem (bug?). The same situation is in Openshot. Pitivi not, maybe its in MLT, i don't know. I have Intel i915, my uncle has Intel as well, and the situation is same. I use at first repository packages and then Sunab too.
I don't know how to say it easy, but when i give cursor somwhere to timeline, it jump back. I have to wait for a momment /1 second/ and then give it to new place.
I can't scroll with mousewheel on the line, where is time. Cursor jump back.