Have you ever encountered a good export with "success" showing all of the files that were exported but then they are not appearing in the folder that you saved to? Even when choosing a second export to the empty folder it asks if overwriting is ok.
I did try that and it worked perfectly! No issues other than that working with Parallels. It's doing what it's supposed to do with no systems upset.
FAB 3000 is not meant specifically to run in an Apple MAC environment. If your using a product such as Parallels, Virtual Box (or similar) than I would recommend that you save directly into the Windows path enviroment (i.e C:\Users\MyDocuments\MyFolderWithGerbersDrills\). Then you should be able to easily transfer those files to your MAC environment.