Sorry no idea regarding pi store, not having static IP address should not make a difference, are you running 3.12 Raspbian dated June 2014 to work with b+ ?
Anyway my advice would be to start again with a fresh install of Raspbian wheezy 3.12.
After that's installed do:
sudo apt-get update
sudo apt-get autoremove
Don't load anything else until after webiopi is running successfully.
Then down load WebIOPi-0.7.0 again unzip and copy the WebIOPi directory to the home/pi directory
cd into webIOPi directory and enter sudo ./setup.sh