To better understand what you are working with, since the 6000-6300 series had several varients, can you answer these questions:
1) does your spider have 1 connector with 19 pins going into the small target interface, or 3 connectors? Assuming 1, due to the fact it cost $88 (been watching that one)
2) What version of the software do you have? It would be labelled on the chip.
3) Does the dart head have the wide yellow spider or the thin one? The wide one will have segments that have little + on them, andI believe the Double Bull will as well. The thin spider will have little bumps along the edge, but not in the middle area. The double bull from the thin spider will NOT fit into the the wide spider. Sounds like you might have an older double bull segment and a newer spider, or you have a double bull segment from another brand.
4) If you have added the double bull matrix yourself, then you may need to enable it if the board does not have it.
Here is a link to the PDF about going from the regular think spider to the newer thin super spider:
http://arcarc.xmission.com/PDF_Darts/Arachnid/Arachnid_Service_Tip_Super%20Spider_(8-16-1993).pdf