If I use the alt + p command on my iMac, instead of getting a "π" sign, it warps me to the next course. It doesn't create problems currently, except for the fact that I have to copy and paste π from another text-box. If it isn't intended, you can check for why it happens.
Thanks for letting us know about this!
It's intended behavior for you to be taken to the next exercise, although I'm not sure if they realized it would override writing π or not when they implemented this.