Alrighty, I did a search for this and the four that were brought up as a match had nothing to do with my question sooo . . .

Where have all the prettiful banners gone from people's signatures?

I see the thank you's for each, still as they would normally be but no banner to accompany them. I don't believe it's affected ALL banners but certainly a significant number have become invisible - at least on my computer!

~Nicole

EDIT: Thanks to you both. And yes, my work computer *does* block photobucket so I didn't even take that into account. Oopsy. *feels ignorant*