When generating Gerber files, try to use the following settings (where available):

File format Extended Gerber (RS-274X)
Polygons (G36/G37) Enabled
Multi-quadrant arcs Disabled
Stroke width for filled areas preferably at least 0.635 mm; avoid less than 0.150 mm
Unit MM
Format 3.5
Zero Suppression Leading

When generating Drill files, try to use the following settings (where available):

File format Excellon
Include tool list Enabled
Unit MM
Format 3.3
Zero Suppression Leading

All Gerber files must have the same origin. All drill files must have the same origin. Drill files should have the same origin as Gerber files. If you generate Gerber files with INCH units, you should use 2.4 as the number format. If you generate Drill files with INCH units, you should use 2.4 as the number format.