Does your Stratux work otherwise? Did you install a GPS or plug a GPS into your Stratux? Can you see traffic and does it show your correct location on iFly GPS?
Maybe your AHRS module is not plugged into the correct pins on the Stratux board. Can you log into 192.168.10.1 on your connected tablet and open the Stratux program? Look around in there and make sure there is not a setting you need to turn on.
Otherwise, maybe the AHRS is defective.
EDIT: I doubt you need to reformat your card if it was working properly before you installed the AHRS and updated your program. You could try a different release of the Stratux program.