Hello Ehcor8, i had the same problem (crash with videos) with my laptop (AMD 
Radeon HD 6310) and i managed to fix it.
You might intall the proprietary display driver manually, now it work well for 
me (fluid 1080p videos).
You can find a good tutorial at : 
http://www.upubuntu.com/2012/03/how-to-install-ati-amd-catalyst-122.html
But there are some mistakes in it!

You should write --purge instead of -purge in the terminal.
( sudo apt-get remove --purge fglrx fglrx_* fglrx-amdcccle* fglrx-dev* 
xorg-driver-fglrx not 
 sudo apt-get remove -purge fglrx fglrx_* fglrx-amdcccle* fglrx-dev* 
xorg-driver-fglrx)

Then you should enter "sudo sh ./amd-driver-
installer-12-2-x86.x86_64.run" instead of "sh ./amd-driver-
installer-12-2-x86.x86_64.run".

If like me you had an error with the installation (the installer says that old 
drivers are still present) just enter 
"sudo sh ./amd-driver-installer-12-2-x86.x86_64.run --force", it worked for me!

If you have any question or if you need a translation in french, do not
hesitate!

A+

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Title:
  jockey-gtk crashed with TypeError in _execute_child(): execv() arg 2
  must contain only strings

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