Sorry about that. It has something to do with the chromium-browser code.
I have a way to get back in if you are capable of doing a few things - think of this as a learning oppurnitity.
You have to enable SSH to allow you to get into the Pi remotely. The tricky part is that Piper disables SSH everytimg you boot, but I figured out a get around.
First you need to find the IP address of the Pi on your network. If you have an iPhone, go to the app store and get 'Fing - Network Scanner'. Once installed run it and do a scan - somewhere in the list you should see a 'Edimax' or 'Raspberry' - record the IP address
Next, power off the Pi and put the SD card into a card reader and connect it to your computer. Now create a TEXT file with one blank chracter and save it with the name 'SSH' and no extension. Now you should see a device attached to your computer called 'boot' - copy the file 'SSH' to the device and then unmount it.
Put the SD card into the Pi and power it on.
Now you have to SSH into the Pi from your computer. If you have a Mac it's easy, if you have Windows you need to install 'PuTTY'. Here is a link to a tutorial for installing and running PuTTY
On the Mac go to the Applications/Utilities folder and run the Terminal program. At the prompt enter
My Pi's IP address is 192.168.48.118 so I enter 'ssh firstname.lastname@example.org'. For the password use 'piper' and if everything worked, you will see a prompt:
pi@raspberrypi ~ $
if so you are in business so enter
sudo apt-get remove chromium-browser
and reboot when it finishes and you shoud be all set. (and you have hacked your way around a problem )
Let me know if you have problems