I have a pretty strange issue with the gerber viewer. At the default zoom level, there are these small black dots that appear all over my layers. I only see it with the copper layers, and only where the copper isn’t being drilled.
At most zoom levels they aren’t there, but zooming in two mouse wheel scrolls from the default brings them back, as does zooming three or four mouse wheel scrolls out from the default. The spacing is different at the different zoom levels.
I have the grid off in items, so it’s not that. It seems like some sort of rendering glitch to me. See the horizontal line of this screenshot where some of the dots are missing? If I zoom in on that area and zoom back out, the line of dots is completely there, and there’s another area that’s missing some dots.
It looks like KiCad has filled the zone with traces. This shouldn’t be so, and I don’t know why it happens. There only reason I can imagine is this (speculating):
Going back in history, KiCad filled zones this way. The board is made with an old KiCad version and zones have a setting which controls filling. That setting is hidden in new KiCad and can’t be set/unset, but KiCad still uses it.
Can you share the project (or at least the board file)?
Here’s the unmodified .kicad_pcb file. I removed the “(mode segment)” in the two locations it appeared in the file, generated the Gerbers from the modified file, and that solved it. Thanks a lot for the help!