Never seen this on my aircraft neither on the forums. Maybe a plugin conflict you installed?
attach your xplane log.txt file found on your xplane root folder after this happens.
MaxxFX does something completely different from SkyMaxx Pro; it manipulates the colors and effects of the entire scene. MaxxFX and SkyMaxx Pro may be used independently from each other; there are no dependencies between them. So you can remove it if you want to, but you will be removing MaxxFX's functionality by doing so.