Are you using FeralHeart or FeralHeart+? Assuming you're using FeralHeart, you should try pressing the 'B' key, to open the Biography tab. There, go to 'Home' and first Reset Home, then Go Home. This can happen if your character was left in a custom map which was later deleted. If this doesn't work, try changing rendering systems, as mentioned before. Of course, reinstalling is also an option, though it's usually a last resort to myself. If you see textures missing, then you should do such.