Re: SM Player doesn't launch
Mind you SMPlayer config would usually be in $HOME.config/smplayer/smplayer.ini. Before delving too deeply into config files perhaps try to use the latest version from the PPA of the SMPlayer developer. This single command should do this:
If the problem persists try running MPlayer from the cmmandline and see if that is running ok...
sudo add-apt-repository ppa:rvm/smplayer && \
sudo apt-get update && sudo apt-get -y install smplayer smtube
You think that's air you're breathing now?