Enabling SSL

Enabling SSL is always a bit of an adventure, but it went pretty smoothly this time for https://www.nimblebooks.com.  Two hours of googling, thirty minutes on the phone with customer service.  However, there are still things broken.  I am running a single WP multisite installation and want to have two distinct TLDs: nimblebooks.com and fredzannarbor.com.  I don’t actually need SSL for fredzannarbor.com just yet (no commerce or sensitive info), but things seem to be getting confused when I jump from https:nimblebooks pages to http:fredzannarbor ones because the server is looking for https:fredzannarbor.  Will probably bit the bullet and get an SSL cert for fredzannarbor.com.