From description of Ear-Piercing Scream:
"Description: You unleash a powerful scream, inaudible to all but a single target. The target is dazed for 1 round and takes 2147483647d6 points of sonic damage. A successful save negates the daze effect and halves the damage."
I think there's something wrong there, as much as I'd love to deal two billion d6 damage.....
Thanks for the report, but this has already been fixed for the next release. Try 6.07.08 for the latest fixes and newest supplements. \:)