Comment 7 for bug 538026

Do you use the official version of MLT or the last available (i.e; 0.5.10). If no, you should use the last who could resolve your synchronisation problem ?
Add this PPA if you want to have the last one and inactive it after : sudo add-apt-repository ppa:sunab/kdenlive-release
You will find the last version of the Frei0r-plugins and of MLT.
What are your input file ? ( a way to know it better here : http://openshotusers.com/forum/viewtopic.php?f=27&t=635)
Strange that Openshot Crashes very often. What have you in the terminal when you launch it with ?