I opened a Drawing and did a Pack and Go into a folder I had just created, with today's date as the folder name. A new folder "Miscellaneous" showed up in it without me doing anything, with a "Date modified" time several minutes in the future, which I thought was rather odd. At first it was empty, but after the Pack and Go was finished it contained a single Part from my Assembly, and it's one of my Library parts that I neglected to de-select from the Pack and Go dialog. Still, this never happened before. Maybe that's the time it planned to put the Part in the folder?