I thought I would post this here because I tried to get help and searched for weeks to solve my problem. There may be others in the same boat so this could help someone!
On my site people don't go directly to the shopping cart. They go to the main intro area, and then link to the shopping cart. If you are trying to install a shared SSL and it is not working, this might be why.
If you have not installed OScommerce to be the entry page of your website, then you need to add to the file path.
e.g if you type in "www.mywebsite.com/osc" to get to your shopping cart, rather then just "mywebsite.com", then you have not installed OScommerce in the top level. Your https:// paths will need to look like this:
EXAMPLE: 'https://webhost.phage.net/~myname/osc');
notice that added "osc" on the end. Thats the folder under which all of my OScommerce folders and files are installed. Usually it would just be
EXAMPLE: 'https://webhost.phage.net/~myname');
So if your cart is not in the top level you will have to add the folder name it is installed under at the end of the usual https path. That goes for all of the https paths you change in admin/includes/configure.php and includes/configure.php.
I hope that makes sense & hope it helps someone too.
**Remember to backup**
