Target selector not shown after a while

The target selector is not shown after a while after opening a project. See the attached screenshot for pressed target selector without the selector pop-up. When this problem occurs, the context menu of the top level items in the projects view also gets lost. (I have observed this issue in a Session with 2 projects.) However subitems' context menus can be viewed.

This is my first long session of using QtC 4.4 after the upgrade. So it may be temporary but the problem repeated after at least 2 restarts.

The workaround is to restart Qt Creator.

This issue made me realize that, without the target selector, the only other way to change targets is the Projects view. This is very inconvenient with tiny drop-downs placed on different parts of the screen.