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I've just got back from holiday and my new CF cards have arrived. so i have 3 x 8gb + 1 x16gb unfortunately i can't get the 16gb to be either a master or a slave with an 8gb, what ever i do only one of them is detected, what makes it stranger is that an old 8mb card is detected as a slave to the 16gb card.


Ah.. If this is in the modified setup, then it might be the first sign of this issue (below) appearing:
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Another issue to be solved (if necessary) is how master + slave devices interact at power-on reset time.

Normally, the master+slave device pair talk to each other at power-on, because the master device is supposed to report the slave's condition to the host system when later asked for it.

But here, there are two masters and two slaves sharing those control lines. I'm really unsure as to what they're all going to do.