If you're using a Mac, thrivelivestyle, and you are getting the SSL error, please see this thread over at this site:
(longest url ever?)
Or, just do this:
/usr/local/bin/svn ls https://......
It will ask you if you want to temporarily or permanently accept the "fishy" SSL. Type 'p' for permanent. Then go back to the checkout process from the SCplugin menu and complete your data transfer as outlined previously in this thread. Hope this helps. Sorry it's a month down the line.