appear-only-when-a-visitor-is-logged-in
I don't think this will solve the problem (I was so happy when thought it might).

See, I don't want to hide the sidebox for non logged users. The problem is that I had hidden the sidebox from SSL pages to avoid the issue (the whole sidecolumn BTW). But when a customer logs in (without having anything in their cart, just going directly) the system will send them to the main page with SSL (https://) and then the non-encrypted warning shows up.