Posted 19 January 2013 - 12:00 AM
Have you recently started moving the files to a different drive? The default operation for drag&drop is move when the destination is on the same partition, and copy to another partition/drive. There are sensible technical reasons for this.
If that's what is causing the difference you've noticed, the simplest work-around is to hold Shift as you drag. This causes the drag&drop operation to be a move - the mnemonic being "shift these files..."
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