I have an issue with my Manta G145B ASG from Allied Vision. It is not detected by NiMAX although it is functional when using VImba, the software provided by Allied Vision. I have tried with several computers, and the problem remains. I also used another camera (also a Manta), and the second camera is detected by NiMAX just fine.
However, I would start with clearing the folder in that NI MAX keeps camera data:
(1) Close NI MAX
(2) The default folder for camera files is C:\Users\Public\Documents\National Instruments\NI-IMAQdx\Data. If you find a folder "XML" in it: Delete it.
(3) Open NI MAX and search for the camera. MAX should try to read a XML file from the camera and it should show up in the folder that you have deleted in the last step. Best case: Your camera now works.
If that does not work please provide more details. Most important: Which version of IMAQdx do you use?