What's this thin dotted line all about?

[devorah_9121]

What's this all about?

[Monika Gause]

Are referring to the thin white line?

It's antialiasing artefacts. If it's possible that you make these into one shape, I would do that. If that is not possible, overlap them slightly.

[Ton Frederiks]

Could also be a GPU Preview artefact. Try Cmd or Ctrl E to switch between GPU/CPU Preview

[Brad @ Roaring Mouse]

If you are seeing this on an exported image format like PNG or JPG, make sure to select Art Optimized under the anti-aliasing pulldown.

[devorah_9121]

None of these suggestions help...

[creative explorer]

@devorah_9121 can you check to see if it it an actual line. Change 'Preview' to 'Outline' (Command Y on a Mac or Control Y for a PC). Curious to know if it's an actual line with a stroke of a dashed line. 

[Ton Frederiks]

Try: Preferences > General and turn off Anti-aliased Artwork.

[Monika Gause]

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@devorah_9121  schrieb:

None of these suggestions help...

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Please provide the file.

Without knowing what's in the file, this will be stabbing in the dark.