I tried activating a different theme, decided I didn't like it. Went back to Duster, went to the Widgets page and put the widgets back the way I wanted them: Twitter, Archives, and Meta in the sidebar and Links in the footer. Only... they aren't working in the sidebar. No sidebar widgets are showing up on any of my posts or pages. The Links widget in my footer is working.
The blog I need help with is doctroid.wordpress.com.