So if that theme is TwentyEleven, it should be fine. But looking at your version, it seems you may have customized it a bit, so it's possible there's something off. Let's see if we can figure out what went wrong.
Installing the plugin again won't fix this particular issue. Let me ask a couple of other questions:
- How much did you customize your theme?
- Have you used the custom templates for BD at all?
- Have you made any other customization to BD? (CSS, PHP, anything)
- What else changed at the time you updated BD? Anything else?