Why are there rectangles in my plots with Seurat v3.2.x?

If you updated Seurat recently, you might find your FeaturePlot() and DimPlot() giving plots that look pixelated instead of the circular dots we are used to. Don’t panic, this is because in a recent update, raster = TRUE becomes default for FeaturePlot() and DimPlot() when your dataset contains more than 50,000 cells.