Apple just released a 10.5.4 update for Leopard. If you have Software Update running automatically you will be prompted to install this package. As usual, please back up any important information before installing anything as substantial as a system update. To read about what it is addressing go here. I also suggest perusing the Reader Report on 10.5.4 at Macintouch for a couple of days before going forward to assess the fallout (see my Forever Blowing Beta entry from June 7). This update does document an important fix regarding the Adobe file corruption when opening or saving a file over a network to a server which is good news indeed.