I use kdenlive 0.9.6-0ubuntu0~sunab~precise1 and melt 0.8.8-0ubuntu0~sunab~precise1. Sometimes dissolve doesn't work at the end. Maybe it is a question of the source material. It looks like HD 1080p work, but old DV-material from 4:3 and 16:9 with 720x576 doesn't.