This is a known issue that is purely cosmetic. Apple is currently investigating the problem. There is a rare circumstance in which an open text clipping window will not redraw correctly, such that the included text will be absent or partially cropped, but redrawn in a separate window fragment in the upper left corner of the desktop.
Steps To Reproduce
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Step 1
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Open SimpleText or any other drag and drop capable application.
Step 2
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Drag a text selection to the desktop to create a clipping file, then open that file.
Step 3
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Bring SimpleText, or anything but the Finder, to the front.
Step 4
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If you then double-click on the clipping file again (even though its window is already open), whatever portion of the CONTENTS of that window that was obscured by another window (even a Finder window) will be cropped out. However, the complete contents of that clipping file window WILL be displayed in another separate white box in the upper left corner of the desktop, below the menu bar. This box will have no borders or scroll bars, and will not be redrawn if another window is moved over it then moved away.
- This will not occur if, in the previous step, the Finder was allowed to come completely to the front and finish its redraws before double-clicking on the clipping file.
- Even if the clipping window is NOT obscured by any other window in step 4, if you simply move the clipping window anywhere after double-clicking its icon, the effect will be reproduced.