My site is using the "Extra" magazine-style theme from the popular Elegant Themes company. The front page is set to an Extra "Category Layout"
When SmartCrawl is enabled, the front page's title is taken from the first post, and the widget visibility settings are as well. In short, the front page displays but the metadata for that page is taken from the first post.
I'm fairly certain this is an issue with SmartCrawl, as I don't have this issue when SmartCrawl is disabled. I do have a similar issue when Twenty Fourteen is active.