X crash when I try to edit some titles...

Hello everyone,
I'm pretty new to kdenlive and I don't know if it's a bug or just something wrong with my machine but I noticed that kdenlive crashes the X server when I try to edit some titles... Or when I enlarge the preview window... And now I realize that happens when my title is actually bigger than the frame size... I made a quick video with my phone for you to understand better :

http://www.youtube.com/watch?v=NgzG5SFr7Ts

So is it a bug ? I'm using ubuntu 10.10 64bits and kdenlive 0.7.8 from the sunab ppa. Oh yes and I found that the installed version of mlt is 0.7 and the recommended version is something like 0.5 , so I wonder if this might cause a problem ?? (I don't think considered that the 0.7 package is provided to me via the sunab ppa...)
And I'm working with a PAL project. And sorry for my clumsy english, I'm tired, and french hahaha...

Forums:

Yes, mlt 0.7.x is too new for the release version of Kdenlive 0.7.8. It should be mlt v0.5.10.