Make sure you own the directory and files (note that if you ran it as root, the game might have created files in its directory owned by root)
Try adding yourself to the video and audio groups.
e.g. in /etc/group
audio:x:11:grogan
video:x:12:grogan
When I'm the only person operating a system (i.e. not some server with multiple admins) I might edit that file directory, but a more correct way would be to use the usermod command
Code:
usermod -G audio,video grogan