Right from the start, I can't see the default sphere, just black on black. I can see the wireframe if it's turned on. Changing materials makes no difference. Going into paint mode and everything shows as it's supposed to.
Nevermind, I got it working. I redownloaded and reinstalled it again. This time after uninstalling the old one I searched my computer and deleted Sculptris data files that were left behind by the uninstaller.