Disappearing sounds / panels

I've recently been trying to incorporate an ACS GPS gauge into a couple of my aircraft panels in fs2002 Pro, and have now lost the sound from one, and the complete panel and sound from the other. Both sound files are simple .cfg alias links to the usual b737-400 default sound folder, and the panel is an alias link to my fsfsconv directory.The sound files work ok when loading the default 737-400 aircraft, and I've checked that the the fsfsconv directory contains the panel bitmaps and cfg file. All looks ok, but ther alias links don't seem to function anymore.Can anyone tell me what I've done, and point me in the right direction for putting things right?Losing the panel I can understand, but losing the sound ??I'm baffled.Ron