My models are simple compared to most on here. The sketchfab rendering engine presents them very pleasingly; they greatly resemble simple drawings, which is what they are supposed to be, but lately there is a problem. The uploaded lines have begun to render in white where they were black before. Vastly prefer they remain black. I noticed this after encountering a short site outage a few days ago.
Can anyone give me some guidance as to how to revert line color?