Everytime I click on a color swatch or with the eyedropper, it immediately shows up in the background color. I then have to "switch" the color I want into the foreground. This has never happened before. Do you think I hit something strange by accident?
In order for the eyedropper to load the Background color, typically, you hold the Alt/Option key while clicking. Assuming your hands are away from this modifier key while you are clicking maybe the Alt key is sticking (a spilled beverage perhaps?) or just not working right. If you have another keyboard try it and see if that helps. Unfortunately, when selecting a color swatch, the theory falls apart. In the Swatch palette, you hold the Ctrl key to load the background color. (the Alt key will delete the swatch.)
You might want try deleting the Preferences and see if that helps. Click here to learn more.