Nick1H

Thanks for the hint.
This also happened to me as a result of WP update 4.0.1
Removing all quotes in NextGen shortcodes fixed it for me.
Which, I have to say was a pain in the a** because if you have been using tag_ids with tags which include spaces, all the tags have to be edited to remove spaces.

Awesome! That fixed it. Thanks.
Really like your plugin.

CSS is easy. Unfortunately your suggestion does not work; I already tried messing about with the custom-background class.

It may have something to do with this error which shows up in Firebug, only on the custom login page:
“TypeError: element is null
element.parentNode.removeChild(element);”
from: “wp-admin/&reauth=1” (line 21)

Thanks.
I did that (with !important) and it removed the top margin ok but it still doesn’t look like the regular pages which have the margin filled in with the background.
Still, it looks better now.