I also had that the other day. I had to redownload it again as well to get the certificate working again.
I also only need to click an icon ones if I already used that in Launcher before from the Notification Center. The only downside of this is that it needs my TouchID after that to take action on the matter so two steps.
I love to easily see my current WIFI, Bluetooth connections and to switch easily and also to turn off 3G although it's unfortunately that for both of these you still have to be redirected to the specific Settings for that.
I also love the smart contact launchers to easily get in touch with someone via either phone, facetime audio/video, e-mail or whatsapp/telegram. I'm missing the option there though to send a predefined message to a contact which you can do with a separately action but it isn't yet available in the smart contact launchers area.
Greg wasn't even aware the certificate had expired until I emailed him. LOL I don't recall seeing anything about a predefined message. Sounds interesting.