So it is obviously a problem with ACamd or DVBLink. It's stopped talking to OSCam since I put the second tuner in.
What are your config files like when running two tuners?
darkraid: There shouldn't be any problem with OSCam. It reads the card and sits there waiting for a viewer.
There isn't a problem with the TV Tuners themselves as they can both tune into Freeview on WMC through DVBLink.
port = 15000@096A:000000
serverip = 127.0.0.1
key = 0102030405060708091011121314
allowed = 127.0.0.1