Gerber Import - Circle Arc (360 degrees) in a Polygon - Why am I receiving this prompt?

Here's a direct link from the Help Center on this topic, https://support.numericalinnovations.com/support/discussions/topics/14000002387

Most likely the Gerber file was output with low resolution (i.e decimal digits for numerical values), and whenever there is something invalid/ambiguous in the data - you will be prompted by FAB 3000 to ensure you're aware of an issue.  

Note #1: Please keep in mind - Every PCB CAD tool worldwide (i.e Altium, Orcad, Kicad, Zuken etc) outputs their Gerber files differently - and provide their users with various Gerber/CAM formatting options for them to choose.  PCB designers are most likely not fully aware of every specific format option and may be choosing a default or something not optimal for their designs - leading to the potential invalid/ambiguous in their Gerbers - and then being prompted by a CAM software tool when parsing the data.  

Note #2: Every time a PCB CAD tool (i.e Altium, Orcad, Kicad, Zuken etc) updates their CAM outputs there is a new possibility of something invalid/ambiguous in the Gerber/ODB++ files. 

Typically the best thing is to let FAB 3000 automatically fix those errors during import and keep updated with the latest versions.   The latest FAB 3000 V9 has over 500+ New Features, Improvements & Fixes - so we recommend to always stay updated!

Feel free to submit a support ticket and send us any sample gerber file that prompts this message, and we can tell you exactly what/why the message occurred (as there are many variables).