Version 3.0.0 works fine on my C2D MBP with Snow Leopard
. Well, fine except that the default text handling on vector charts
is a mess on most resolutions.
You should indicate the OCPN version number and OS X version number when asking for help.
If you were previously using a much older version you should probably have started by removing the old pref/config files and reloading the charts
. Otherwise, I don't have any ideas. Wait a few hours and perhaps someone in Europe
will be able to help.