So PFS is now free. Yeah!!!!

Problem is that I can not get it to work on a CF card any larger than 4Gb. I can set up a couple partitions at the beginning of the card, but can't get it to format the last couple of partitions at the end of the card. Each partition is under 2Gb, and I can create them fine, but I always get errors when formatting, though this does not occur with my 4Gb CF card.
Any ideas? OS 3.9 will partition and format the 8Gb card just fine with it's version of FFS, but PFS is not working out on this card. Strange.
Also when using PFS, what is the max speed that I should set the card to? The same as when using FFS?
Thankx!