Resizing the launcher messes up the login section

In certain instances, when resizing the minecraft launcher screen, the bottom bar with the logo and login options becomes black (see image). This doesn't happen when using the windows 7 drag-to-the-edge-of-the-screen methods. It also doesn't happen every time, but only when the height is increased to approximately more than 619 pixels. Moving the mouse over the affected areas reveals the buttons and checkbox again, and clicking in the correct place reveals that section of the text boxes (see image).