Well first of all if i offend you i strongly appoligize for that but yes you are right i am a joker
Now to the topic. There is absolut no reason why PIP should not work for you
f you have 2 working tuners there should be no problem.
Some how your PIP plugin must have been corrupted, why??? really cant give a good answer
My QuadPIP works just fine also my PIP and i have also my own modded version of VirtualZap thats working.
Also MiniTV is working and it use pip to show channel in your MiniTV display.
But here is my pip.py file you can try and replace yours and see if that might fix it.
Open Zip file and extract. Then with ftp upload the pip.py to folder /usr/lib/enigma2/python/Screens/
Reboot Enigma2 and try and see if pip might be working.