Liz,
I didn't notice anything different on my bill, but that may be because the $5 off discount was supposed to start next month, and that's fine, as I still received the last of my twelve $10 discounts.
More importantly, though, I was able to make an online payment again by going back to the old website. I realized that I'd only had a problem with my attempted online manual payments in December and January, and had also remembered that both of those payments were attempted through the revamped/new site. I tried the old site again and the payment went through.
I didn't check the "remember" box as I don't know if it will work being that prepaid CCs aren't allowed for automatic payments, plus I didn't want to jinx myself, as I don't know how long the old site will remain up, nor how long it will allow me to continue making manual payments, but at least I can do it again for the time being. I was a little uncomfortable giving CC info over the phone, as I'm sure a lot of people would be.
I just figured I'd let you know regarding the ability to make a payment with this card. It's strange that I still can on the old site, but not on the new site. Perhaps I'm just lucky. LOL.