Sounds disappearing (ie the map ping)

Hello there,

When I was playing Guild Wars the other night, I noticed the sound when you ping the map was missing. I dont know if any other sounds are missing, but this one definately is. Its kind of an important sound to have, and I do not know why it would be missing.

I have restarted the game, computer, tried different characters, etc to no avail. I recall this happening before but dont think I ever found out why. I don't think I changed any settings, but I played with some sound settings anyway (hardware accel, quality, volume) but that did not fix it.

Any ideas here?