Suddenly my Mac (min iMac) is not able to run anymore SL Viewer (version 3.4.0.2.264911). Internet works, I can log in on Windows PC, so I don't understand what can I do to restore the situation. I have tried to remove and reinstall....even previous or Beta versions. Same result....nothing. Please help me out Thanks in advance Actually, I have checked the Security configuration and it was already set according to your suggestions ("accept from anywhere"). Then I have downloaded Phoenix viewer and it works well; while SL Viewer still does not work There is no actual error message produced...after launching the application, it does not even load the entry page to access with username/password I would prefer to use SL viewer, but at the moment Phoenix works....