David Weed
Ansys Employee

I recreated a model with similar parameters and I am able to get crack growth using SMART:
Can you check the ds.dat file for the crack tip node component information (right click on Solution and Open Solver Files Directory); mine has this:

/com,*********** Done Sending CINT Commands For All Cracks ***********
/com,*********** Send Crack Growth "SMART Crack Growth" ***********
*set,cgid,1
cgrow,new,1! Crack growth set
cgrow,cid,1! cint id for crack growth
cgrow,cfcm,NS_ARBCRACK_FRONT! Define crack tip node component
Also, what are your settings for the Arbitrary crack object?