I have been using Draftsight on Mac for months and everything was fine until this morning. Draftsight is not responding when I launch the application, either directly from the application menu or from a dwg file. I have tried to uninstall completely and reinstall latest version but the end result is the same.

I run it on MacBoor Air, with OSX 10.8.3.  which was installed this morning....(most probable cause) I also ran a Hardware test this morning and everything is fine.