When you are on the Features page > Board view, you can select a Feature from the long list of features and see the details on the right. When you then change anything on the detail view which affects the 'widget' of the boardview, it reloads the board and thereby also deselects the feature that you are working on. This is very annoying when working with long lists of features because you will need to search the list again to see where you left off.
Here's a video demonstrating my problem: http://screencast.com/t/i3LDWrIMuf4
The status of this idea was out of date. Currently, the features board will maintain the same position when editing in the drawer. This should make it easier to keep track of the card of the feature you are working on.