Is their any chance that you have P0 wired to something on the development kit's breadboard? You should have no issues assigning a CapSense pin with a different functionality, and then later setting it back.
There is no such issues. You remove all connections and use it as capsense it will work.
Are you quite sure that it is appropiate to answer a three year old thread? As a Cypress Employee?? Won't it be better to read what we users want and reply to that instead of bombing us with hints to appnotes in a USERforum???