Occasionally (more often than not, but not always) when I click on the Streak tracker after completing training, or Start My Day the window goes blank. I refresh the browser window and am presented with the 'completed training' or the Daily Targets panel - from which when I select streak, the calendar appears. The browser (Chrome) reset is a nuisance - I wish the calendar would appear the first time I selected it after a training session or completing SMD.