I'm not sure if this was brought up before, but it seems a majority if not all the sprites in the Vortex vaults are gone, when you click on one to view it, it redirects you to what looks like a search page.

Quote :

[NOTICE: If you like the sheets here,
directly save them to your hard-drive! There are unpredictable
periods when the image provider could shut down, and we don't want you
to lose access to what you want!
Also, AVOID hotlinking/direct linking to sheets here, as that ties up
our bandwidth, and more importantly, do not
continually reload the page.]

...it's all stated there...