I've downloaded and installed HJG's DC-8-50, along with panel and sound, and set them all up accordingly. However, when I load the aircraft, the panel I see is from DM's 1-11-400

My default flight involved the 1-11, so I tried making a DC-8 flight default...it made no difference. I double-checked that I had followed all installation instructions...I have. I have downloaded and re-installed the panel packages...no joy. I can't think of anything at all which might be causing this bizarre cock-up, so if anyone has any advice or ideas, I'd be very grateful.
Cheers in advance
Rich