Glo Calibre cover problem

Hi, I need some help with Calibre.

I converted a text file to epub in Calibre and generated a cover in Edit metadata. Then I transferred it to my Go, and realized the title and author information should be changed.

I opened the file again in Calibre, and in Edit metadata changed the cover info. The cover picture changed to reflect the new title/author, so I clicked OK and then opened the file... but the old cover was still there.

I've seen so many positive comments about Calibre that I presume I'm missing something obvious. :blink: Can someone please point it out to me?

Thanks.
Tom K.

UPDATE: I think I found the problem. I wasn't "Saving to disk" after changing the cover.