Ok, I will make some other assumptions. I assume you are launching normalized PDF's within AE10. And I will assume you have the LBlack loaded in your designer book and the color books are linked correctly. I am also assuming you have color engine 10. If those assumptions are correct then the color is not calling up correctly from the Flexrip. To verify this, map the LBlack to another standard spot color, rerip your PDF and then launch in AE10. If the file works then it is the designer color. If the file fails then you need to look at that log file. If the file runs then you need to verify the colorbook linking. Hope that helps.