I have upgraded from 2.71 to 2.8. Even since the upgrade, the Gallery function disappeared. I could upload individual pictures as usual, but the Gallery tab did not appear, leaving only "From Computer", "From URL", "Media Library". Manually typing [gallery] in the HTML editor gives an empty gallery.
Only when I click "Insert into Post" link of each picture, the Gallery mode reappears.
I really need this function, so if it's removed, I will definitely go back for 2.71. Thanks.