I am a complete novice to Zbrush, and this may just be a simple solution, but I have run into a roadblock. I was following this tutorial online to create a basic knife, and I decided to take a pause for while. I saved the project, and then closed it. When I opened up the file again later that day, all of my subtools were not reacting like they should. I had it so that some were added, some were subtracted, and some were set to difference. Instead of all reacting off the base piece, none of them were reacting like they should. I have the image for what they were supposed to look like, and what they ended up looking like afterwords, as I know that will help more than my poor explaining skills. Any help is greatly appreciated!
