Comment 7 for bug 480894

If you have the version 0.9.53 installed you have of course installed the key, it's obliged.
For the error of mlt i'm borre. I have someone one a forum which have the same thing and i have none solution for the moment . Could you check if you have on your system installed :
libmlt1, libmlt++, libmlt-data, libsvg2-common libsdl1.2debian-pulseaudio python-mlt
Put the result of this command :
mlt -query producers

Another solution perhaps. Me when i open openshot (this version) i haven't none error . I'm thinking because it's a new installation. If after ckecking if their librairies are installed, try to de-install openshot and destroy in your home the file .openshot and check if there is something(a openshot folder) in /usr/share/. And said us. If you de-install openshot try to luse this command : sudo apt-get remove --purge openshot or in synaptic complete de-installation .
Thanks for your help
Olivier