Thanks Tony and Mark for the suggestions. I will give them a try, and see what happens.

As for the left and right buttons, I have been used to a short press moving through the presets (which still works, but doesn't help as all the presets are the same frequency), and a held press causing the tuner to seek tune (which no longer works).

Nothing has changed in the empeg software between this working and not working, except the version of the Hijack kernel (v378 currently). I have tried reverting back to previous versions of Hijack, but I can't be certain which was the last version that it definitely worked under.

In any event, I'd be mightily surprised if it turned out to be a Hijiack problem, as I've never seen anything like this before, and I can't find any other reports of people having the same problem.

Bagpuss.