You ever select a few items and then when switching views.. the selected items unselect?
Happens all the time.. well.. There is a solution to get them back!
Here are some screenshots to prove it.
FIRST: A couple simple items (windows) selected in plan view.
SECOND: A casual change to 3D view (could have been any other view).. and BAM, your items are conveniently unselected.
FINALLY: So here you go... CTRL + LEFT ARROW.
Yep, simply hold down the Ctrl key and hit the left arrow.. it reselects your previous selection.. better know as Select Previous.