I'm using a custom theme, with templates that call NextGen functions, rather than using shortcodes.
Thankfully, my site is relatively unscathed by the update to 2.0.17.
However, the Gallery admin/Add Gallery Images page has been corrupted.
It can function, but most of the formatting has been lost (so I can't, for example, drag-and-drop images).
Checking my browser Developer Tools (and comparing with my development system - where the page appears OK), it looks like there are 3 css files missing :
These seem to be registered as styles by module.nextgen_addgallery_page.php
The scripts in the same function - register_scripts() - are included in the page.
I've tried deactivating / reactivating, and FTPing the plugin again.
The files do exist on my server filesystem.
(I've also reported this through the Bug Report)