Hello, I installed the SAS pro version this morning after using the free version for over a year. Immediately after installing I zipped up 5 PDF files and notice the date modified was 8/25/1992. Prior to installing I zipped up several file and the date modified was 4/10/2012 as it should have been. I have never had this happen and this is a big problem. I depend on the date modified on all files for my line of work. Is it coincidence or is this typical with the pro version. Thank you.