Odd Side Effect?! (Score 3, Interesting)

I've posted this elsewhere, also. I know this seems odd, but imagine my surprise. In my home/Documents folder I have a subfolder named "Unstuffed". I have dircted Stuffit to place all of its results in this folder. It's been there for over a year. After running todays security update the subfolder was renamed "Documents", and a file called "Documents.1" was created in the original "Documents" folder. So now, in my home/Documents folder I have a subfolder called "Documents" (with the contents of the old "Unstuffed" folder) and a strange zero k file called "Documents.1". Never seen that happen before.