a few things , ,when in scan mode can you see the control channel on the display for one site , says the closest one to you,
I know my first time with freescan it did not take I had to go in and change some settings, I could see the control channel being picked up, that is the key, If radio does not hear control channel it will not be able to decode the P25 when non encrypt channel comes in
did you also delete all those US based pre-programmed systems, you don't want to scan thru a bunch of system that don't exist up here.
Best to send me or someone a copy of the system the way it looks on your scanner so we can see where you may have missed something. Can you say receive anything conventional , such as air band , business , taxi etc, or weather radio ?
Isolate one system the one control channel for your area say 139.8 or whatever it is, then go from there.