I am using Affinity Designer version 1.10.1. on a PC. I am not creating a pattern. I am simply trying to fill my document with purchased seamless patterns. I have watched all the YouTube videos and and looked at all the forums and it appears that this is not unique to Affinity Designer. However, I need a solution that works. I have tried looking at the transform window to make sure the pattern does not have a fraction. I have tried viewing the layout in "Pixel view". I have tried rastering and trimming. I have tried filling with the pattern. I have checked my snapping elements in the snapping manager, I have tried nudging and all do not provide a solution to this white line or "gap" between the pattern layers. However, after spending way too long trying to figure this out, I have seen where some seamless patterns do not produce this gap with my environment and others do. So now I'm wondering if it is the actual pattern that could be flawed.