Need help with TotalFinder Dual Mode (EDIT: I figured out the problem)

Dual Mode used to work fine for me, but now I am having a problem with it. When I am in Dual Mode and I click open a folder in one of the panes, the folder opens as a new window instead of opening in the original pane. I didn’t change any of my TotalFinder settings, so I can’t figure out what is wrong. Any insight/advice would be much appreciated. Thanks.

EDIT: something went wrong with my finder preferences, not TotalFinder. If this happens to you delete the file in ~/Library/Preferences and then restart the Finder.