Firstly are you PAL or NTSC? NTSC
How are you monitoring the outputs, (monitor, deck etc)? Are you using a junction box or a Medusa cable (loads of cables from a single connector)?
Media 100 Junction Box?
You mention that you can’t access the DV output. “I can’t access the DV input either.”
Media 100’s only output to the firewire port on the card, and only when mastering, and then only if you tell them to. “I can’t select DV because the selection DV won’t light up.”
To test this try mastering to tape with the machine control set to none, and with the DV checkbox on the master to tape window on. “I’ve tried this but the DV selection will not allow me to select it.”
Oscar