While I was making a family tree, I opened someone else's tree through a link in a separate tab. This person had customized their box colours and background. Now whenever I reload or open any tree, including my own, it uses the settings from that one particular other person's tree. It doesn't matter how often I reset everything and click save, or log out of my account and close all tabs, that one person's settings are always back. How can I fix this?
Restarting my computer fixed it.
