If you are writing a page, in design view, double click a button to add it to the page, click next to it, to deselect it and double click on a new button on the toolbar again to add another in. Select the first one and do something with it like change its name or text. You will find that the actions you just performed happened to the other button even though you can clearly see the first button is selected in the design area, but the properties are displayed for button2.
Does anyone else have this issue or is it the way I am holding the mouse or something.(!!?!)