A new version was uploaded to Android Market and will be available for upgrade shortly. This release fixes some small bugs and introduces a new feature, which allows to zoom in up to a resolution of one hour. It also adds a new language (Slovak) kindly provided by Silvo.
Note that there are no preset buttons for the highest (hourly) and lowest (quarterly) zoom settings. These settings are only reached by using pinch zoom or the new zoom function available in the lower right and left corner (touch the corner for the next zoom stepping).