Now I just checked mine and on the new computer, running Win7 64 Bit, it stays checked. But I recall emailing Skuzzy about this, wont post any of those personal, private communications here, when I was using my older rig which ran WinXP.
Pretty sure Skuzzy would give me permission to share Pyro and I'm 99% sure I have them but there was no resolution then and I'm pretty sure Skuzzy was in the same boat you are with non duplication.