With melt version 0.8.8+git20130205.9fd121cd-0ubuntu0~sunab~quantal1 from kdenlive-svn I tried twice and got different backtraces, see attached dbg.txt which contains both.
With melt version 0.8.8+git201302 05.9fd121cd- 0ubuntu0~ sunab~quantal1 from kdenlive-svn I tried twice and got different backtraces, see attached dbg.txt which contains both.