List of Plugins that is not compatible with Job Board Mobile
For those who are experiencing 400 and white screen errors with Job Board Mobile (JBM) this might be your cause.
It seems that the following features with JetPack have issues with JBM when activated:
Mobile Theme - Causes White screen error with the home page
WordPress.com Stats - Causes White Screen error when Viewing Dashboard & Search
Gravatar Hovercards - Causes White Screen error when viewing Blog News Post
Other Plugins that may cause errors
Any Cache Plugins
Hopefully the next version will address these issues.