While attempting to download software from web sites, the moment I hit the 'download' button, the page turns black, and no further action is possible. The problem seems to have started with the installation of Snow Leopard. Have tried logging in as a different user, and have deleted all the questionable after-market software I can. Nothing helps. Am running 10.6.1 with Safari 4.0.3 on an Intel iMac. Any suggestions will be appreciated.