SOLVED: Using a Shared SSL Cert with CMS

[pjb]

I'm trying to use the shared SSL certificate provided by my hosting company (Site5.com) to get an https:// connection using CMS Made Simple 1.9.3.

To use the shared SSL, Site5 requires users to address an https:// page with a URL of this form: https://servername.site5.com/~username , where servername and ~username are replaced by the machine name and the hosting account username.

I have modified config.php to include this line:
$config['ssl_url'] = 'https://servername.site5.com/~username';
(substituting in my correct server and username)

and that allows me to access the page under CMS, but the yellow security"padlock" on the https:// page bears a red exclamation mark, with the message "Warning: contains unauthenticated content."

The yellow padlock is clear when the page starts to load, but shows the exclamation mark/warning just as the page finishes loading.

Any tips on what else I might need to adjust to get https:// to show a fully secured connection?

[pjb]

Further testing reveals that the problem here is a known issue involving the Captcha module http://dev.cmsmadesimple.org/bug/view/4980, which causes that module to access the Captcha graphic via http:// instead of https://. That's the reason for the warning about the presence of non-authenticated content on the https:// page.