Maybe I'm the only one with this problem, but I'm taking a chance and assuming someone can help.

First things first, I make lots of banners. I've made many before my most recent one, and successfully added relevant tags to all of them.

But with my most recent, nothing would take. I'm given the option to add, but then when I either tap "enter" on my keyboard or when I click the gray '+' sign beside the entry box, nothing changes.

If anyone has any idea what's going on, I'd be very grateful!