A while ago, I noticed an unusual visual artifact in PowerPoint 2013: sometimes, the selection rectangles (from dragging with the mouse to select multiple items) don't go away. A little fiddling around revealed that the glitch only occurs for zero-area rectangles, selections where the starting coordinate is the same as the ending coordinate for one axis. Selecting a region with nonzero area works as expected; the rectangle disappears after releasing the mouse.
I'm guessing there is an "optimization" to not bother erasing a zero-area rectangle; perhaps somebody forgot that at least one pixel is always rendered to display the edges of the rectangle.
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