No Rendering when Titles are added !

Hi guys ,

i have been using kdenlive for sometime , recently i installed ubuntu 12.04 and installed kdenlive from software center.

after i add titles (just plain one without any effects) render progress bar goes from 0 to 100% in a flash and output file is 0kb.
but when i remove those titles i get the expected result that is a video without any text titles.

i believe this is something to do with rendering. and i am lost on resolving this.

please help me to get my text titles rendered.