Do you know if the HAT actually works (eg from Python)?
Do you still have to enable the GPIO in Scratch - it’s a long time since I used it and only played a bit but we had to enable the ports (gpio server on) then set the HAT as an add-on as the first few blocks. Sorry I’ve not got any other notes from the Jam
One other question...Any reason you are still using Jessie as it is well out of date now?