[Dx4win] WHAT_DID_SCREW_UP_NOW?

[George]

I took a look at my log today and just noticed that ALL the QSO's "QSL DATE" had the date of 01/02/2007??? 
I use this entry to keep track of when I send QSL's out. What did I do to screw up this date? Why did DX4WIN populate this date in all my QSO's. 
Lucky I had a backup that was only a week old and I used this and added the 10 missing QSO's.
I was screwing around with trying to make labels around that time! Did I do something to deserve this?
How did I accomplish this without knowing what I did?
Thanks.  W2YJ