.x3g file acting weird while printing

[Nada]

Hey,

I am currently working on generating an .x3g file for my makerbot SD using the software ReplicatorG. However, whenever I input the file to the makerbot, the toolpath and the extruder movement is right except for the fact that no material (filament) comes out of the nozzle while moving. Why is this happenning ? How can I fix it ? 

[Dan Newman]

1. Which Makerbot printer,
2. Which firmware in the printer,
3. Which version of RepG, and
4. Which Machine > Machine Type (Driver) have you selected in RepG?

This is exactly the behavior you would see if

a. You are using Volumetric 5D gcode with older firmware,
b. Using non-Volumetric 5D gcode with newer firmware, or
c. Are using the correct style of gcode but have the extruder axis "inverted" and
it's turning but in the wrong direction.

Dan