Piwik not tracking https now

Until January 24, our website was not secure (http) until the user logged in and then became secure (https).
Then we change the site to be completely secure (https).
Now Piwik is not tracking the page titles and custom variables. It shows a visitor, but has URL not defined.
I noticed that when a visitor used a bookmark of http and accessed the site, Piwik tracked his userlogin and all of the page titles.
How do I get Piwik to track the https pages? I welcome your ideas and guidance. Many thanks ~ Dianna

I was able to resolve this by adding SSL to the piwik server, and changing the tracking code to the new https piwik server.