I've had this exact problem a few times with my Melancholytron filter. Yes, it's legal and registered. :-) For some reason, it won't apply if I've been using several applications and surfing the net prior to opening Photoshop, however, if I open PS soon after booting up, there's no problem. It doesn't happen often, but is obviously frustrating when it does. A simple reboot always solves the problem, which leads me to suspect maybe it's RAM related, although that's sort of odd, considering that my computer has plenty of physical and virtual RAM available. I've seen people complain about this with the Flood filter at the PS newsgroup. One respondant said that you can get a "reset" .exe from Flaming Pear, although I have no idea what that does.