Rendering only 2:10 from 6:50

Strange thing happens to me, I have kdenlive 0.6SVN on Hardy Heron. All works great, except rendering:
it renders just about one third of my video, than stops like if the render was succesfull. It is quite annoying.
Any ideas? I've tried all export codecs with no luck, still the same.

[UPDATE]: at 2:10, there is one change in the time line: until that point there are .dv files, from 2:10 there is DV AVI Type2 (both captured from my MiniDV through Kino. Between them there is cross fade.
If I render just few seconds before and after, i renders all. Strange.

One more thing: yesterday it was exporting without problems! I think I had no changes, or updates tonight.