I have specified for a raft to be used in my current process, but when i go to create the print file it is not applying a raft to the design. I have printed using a raft in this software before. Not sure why in this situation it is not working.
Do you have a second object with a different process (esp without a raft) printing near your object that is using the process with the raft?
I found that if I have 2 different objects printing with different processes too close together, S3D will not include the raft if they are closer than the raft inflation + the skirt size.
S3D doesn't seem to notice this problem itself - when you automatically arrange the items they can still be too close together for the raft to show up.
The other think I have noticed. If you put a large negative number in the gcode section for Z the raft will be placed below the grid/build platform and not visible from above.