I created a circular motif in AI based on circles populated by a self generated pattern brush.
Having completed the work I exported the document as a PSD file to add some textures in Photoshop. On opening the file in Photoshop I detected faint lines imperceptible in AI at the point in the circle where the pattern brush motif joins.
I have tried numerous things to make them disappear but everything I have tried failed. Even making a new pattern brush along the same lines made no difference these too displayed the same artifact's when converted to PSD.
The attached file is a test file but shows the issue I am talking about.