Custom Top/Bottom Panel Not Working

Hi,

It's a long since I tried the customer Top/Bottom panel but it no longer seems to work on my wiki. I'm guessing I've changed things too much, how can I get back to selecting my own Custom Top/Bottom panel? I have tried 'Top Panel' edit and entering text, but it never seems to save, and so my Top Chanel does not change. The Logo option does work though,

Cheers,

John