Black Showing Up in AI Preview
I'm working on macOS Big Sur 11.4
3.5 GHz 6-Core Intel Xeon E5
32 GB 1866 MHz DDR3
AMD FirePro D500 3 GB
I'm creating packaging dielines, and the white areas on my dielines show up as black in the AI preview and in the Mac preview (the colors appear normal in Adobe Acrobat). The printer is printing the wrong version with the black in place of white, and I don't know how to fix the file for the printer. When Illustrator is open or when the file is open in Acrobat, the colors are fine. It's only in the Mac Preview that the colors come out wrong.
By any chance you're using Spot colors to define the die/fold lines? Preview app at times has issues with spot colors.