I've had this same problem, on and off, since CS3 (though not yet with CS6). Sometimes in quite simple files; a box with some text, no clipping masks, and where nothing in the file has ever bee in the area where the box suddenly appears (usually off the artboard). My usual way of dealing with it (found quite by accident), is to select anything else in the file, click it one more time to 'anchor' it, then use any of the align tools (see below). The anchored object doesn't move, and, nine times out of ten, the box is gone. For that persistent tenth time, I have been simply closing and reopening the file (that always cures it), but next time I will try your trick. Hoping someone will eventually figure out where this ghost comes from, -- OB
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