Does the toolpath view look complete in CamBam? If you hide the layer with the text it should be easier just to see just the toolpath.
If the toolpath looks OK in CamBam, the only thing I could think that may be the problem is if you are running Mach3 in evaluation mode and it is cutting off at the 500 lines limit. If you go Help - About in Mach it should tell you whether Mach is registered or in evaluation mode.
I hope this helps. If not, feel free to upload a file and I will investigate.