Thanks for contacting me. To receive the best possible support, please provide the complete gerber files (not just a mask layer or screen capture image) or send me your FAB 3000 workspace (*wrk). Where is the specific problem occurring:
1. Importing files into FAB 3000.
2. Building components (menu: Assembly Build Components)
3. Assign Refdes/Rotation?
4. Exporting the X/Y Centroid file?
The more details/files I can receive the better support assistance I can provide.