MPro is a great monochrome iOS app and it’s just under gone a rather critical update. Following the previous update there were problems starting the app, fortunately this is now a thing of the past. The developer has also added an upload to Flickr feature, there’s also a fix to Exif data about timestamp and a change to the app icon.
This is a free update, if you have previously downloaded this app. If not, you can pick it up here. It retails for $1.99/£1.49.