I've tried sending 2 different things to 2 different friends today through the Gift Center with no avail. One to a new friend and one to a friend I've known almost as long as I've been on this site. I made sure the names were typed in correctly and that I wasn't missing anything several times. I didn't see this posted anywhere. Apologies in advance if there is a post somewhere about this issue.

do their usernames contain any special characters such as . - _ ??

Nope, their UN's are and

I got an error saying that the user doesn't exist.

Like I said, I checked for all possible errors on my end. :/

I'm using Firefox, and no, not that I trust or have on my computer :s I've never had problems with this in the past :/

Have you tried using the gift option on their profile? Right under the battle scores it sends you to the gift center but it puts the user's names down for you.

I can't think of a time that I have in the recent past ^-^

Yes, that's what I found and eventually ended up doing instead. Thank you. :)