I also believe this is a theme issue. Your themes must be in the /usr/share/themes folder and I assume your themes are in the /home/your-username-here/.themes folder. Step by step instructions below in case you need them.
1. Open 'Terminal'.
2. Type gsku nautilus
3. Once the nautilus window appears, press Ctrl+L, and then type /home/your-username-here/.themes
4. Copy all of your themes and then, in the same window, navigate to /usr/share/themes and paste them there.
5. Open 'Cinnamon Settings' to make sure you have duplicate themes.
6. If you do, you can delete the themes out of your /home/your-username-here/.themes folder.
Hope that works for you!
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