Good morning,
I have the ggbt extreme but pretty much the same as the UD5 - I have had no problem booting from the array when it was attached to my extreme.
I am currently using my 3520 on a different machine though.
I have used the 3520 on at leat 3 different mobo's and not had any problem like what you are describing.
Did you try different ggbt mobo bios?
Make sure you have the latest firmware loaded on the 3510.
Also - not sure but it might be that you need to have at least one drive set up on the 3510 for the bios to recognize the drive connected through the 3510.
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