Tascam 144 No Signal in Logic Pro (MacOSx10.8.4)

Question

Just picked up a TASCAM US-144 MkII digital interface, which I'm trying to use to record an MXL 990 condenser mic into Logic Pro 9.ue
The issue is that when I go into logic, arm the record button with the US-144 selected as my input device, and hit record, logic does not pick up any signal whatsoever. Not only does logic record silence, it does not seem to be detecting any signal input from the tascam (the monitors on the left of the screen in logic that detect input and output do not respond when I sing into the microphone or play an instrument through the interface). 
The details:
-I have installed the most recent MkII specific drivers and firmware, and both are fully updated on my computer. The tascam app seems to confirm this to me.
-I have gone into Logic Preferences > Audio and set input device to US-144 MkII.
-The channel strip I am using in logic was created as an 'Audio' channel, not MIDI or software instrument.
-When I unplug the tascam while logic is open, it says 'input device removed', so Logic seems to be detecting the interface.
-When I plug headphones into the tascam headphone jack, everything works properly and I can hear both guitars and microphones played through the device, so I believe the tascam is working fine. Again, I have tried this with both guitar line in and with different microphones, so I don't think there's a problem with the mic cable or microphone I am using.
-In my computer's System Preferences > Sound, the computer detects the tascam as a sound input device and the input levels are sensitive to sound played into the device (that is, the input level detector peaks when I sing into the microphone or play an instrument into the tascam), so my computer is receiving input from the tascam and it is unlikely the USB cable I am using to connect the interface is defective.
-I have exactly the same problem when trying to record in Garage Band, where the program seems to be unable to detect any signal from the tascam. Therefore it seems to be a problem with my configuring the tascam/logic and not with the actual software I am using.
-I have been able to record without problems in the same versions of Garage Band and Logic using other interfaces.
All software is updated, I get clear sound from the tascam, both my computer and logic can detect the device and appear to be receiving signal from it, and it's unlikely to be a problem with my cables or equipment. What could I possibly be missing??? Any help would be greatly appreciated.

Answer 1

Its fine again now.. Think it was because we had set the audio tracks to no input..