Goral,
If you have two identical firewire capture devices or one with multiple ports and identical cameras then Windows cannot determine which input is which, so only one gets seen.
The solution may be get a second firewire capture card (different brand and/or model). We have successfully used four firewire cameras using four separate capture cards all different models.

This situation also occurs with USB cameras, it happens when using two or more identical USB cameras (typically webcams), sometimes two will work if they use different USB controllers, at least that has been our experience.
Steve,
StreamBreeze.net

If both cameras are the exact same model that may be your problem.

Which edition of the software are you running Free/SD/HD Basic/HD?

Have you checked that both firewire (ports) and cameras are working independantly by plugging in one camera into each port in turn and repeating with the second camera? You need to verify this as Firewire ports are notorious for failing usually where they are soldered to the motherboard on a laptop, or more likely on the camera end where the cables get yanked on and causes a bad connection inside the camera.


Steve