Was able to render files fine (running Kdenlive 0.8.2.1 on Ubuntu 12.04.)

Then did system update - uh oh, now rendering will always reach 2%, then jumps immediately to 100%. I do get output, but it is only a few seconds long.

Have reinstalled libavcodec and friends (upgraded to -extra-## package), no luck.

Where next?

Many thanks
Tom

Perhaps Sunabs stable PPA?

https://launchpad.net/~sunab/+archive/kdenlive-release