Sparticka

I am now trying the viewer on a mac. I have downloaded it several times but when i hit launch SL the viewer comes up for a momment and then i get this message "The application Second Life viewer quit unexpectedly. Mac OS X and other applications are not affected." and the viewer dissappears. Has anyone else had this issue?

I have installed the SL linux viewer, logged in, and when i click launch SL i get a message saying The address wasn't understood Firefox doesn't know how to open this address, because the protocol (secondlife) isn't associated with any program. ANy ideas why?