I'm not sure how many AV Linux users frequent the Kdenlive forums here but there are updated Kdenlive/MLT packages for AV Linux 6.0 users built from recent GIT that feature VERY significant improvements thanks to J-B-M's recent herculean bug fixing activities. It is hoped that 0.9.3 packages will be available whenever it is released but in the meantime this is a very solid build to use.
Please read and follow the instructions here carefully:
A sincere thanks to j-b-m for being so quickly responsive to bug and build reports :)
Glen MacArthur - AV Linux Maintainer