Ubuntu 9.04
Kdenlive 0.7.3

I have a collection of mkv files I'm attempting to splice up. The problem is this; if a clip from one file is played _after_ a later clip from the same file has been played, the clip may stutter, that is run very slowly and/or skip. This problem is almost entirely random and I have no real way of reproducing it. It happens when it happens.

The mkv files are encoded with x264 have B-frames. Not sure if this is causing the problem.

In addition, on rendering, the files still stutter and sometimes are skipped or partially skipped.

This is naturally, infuriating, as clips which previously have given no problems at all will now have serious issues if played in a long sequence.