Lately Pix has been opening final stacked single image as greyscale 1:1 light_NGC2070_180s_Filter_L_saved_etc[<*new*> from final RGB stacked image files. Yet previously, they have always been opened as RGB images. Camera used is a ZWO ASI294mc Pro. Checked these images in AstraImage, PS Elements15, and GIMP all opened as coloured images. What have I misssed or incorrectly changed in Pix without knowing?