There is a lot of development going on in the Linux and Raspberry Pi world. Bug can run into bug and other issues if you do not periodically check for OS updates. I try to get in the habit of undating when ever I am adding or reconfiguing new software on my Pi. If your are running The Wheezy distribustion (Debian Linux based) on your Pi then updating the complete OS is very easy, especally if you are familiar with Linux.
Run the following commands to update your system:
# sudo apt-get update
# sudo apt-get upgrade
This may take a while depending on the amount of updates that need to be applied and how fast your network and SD card are. I usually take this time t ogo grab a beer or a coffee.
Next reboot and you should be running the latest code.