Seems like they don't work properly anymore, they now link to the picture directly, which is really annoying.
Example:
gelbooru.com/index.php?page=post&s=view&id=3624785

That's how it was linked by Danbooru. Our bot just copies that link straight-off. That link didn't work on Danbooru either.

I have fixed the source on that post.

Sorry, kinda forgot for a (long) moment how that thing works.

Lately the majority of danbooru's source-links are all direct-linking, which all 403. Very annoying.
No script for the bot that can convert them back to the id links?

No idea how it'd be done, but replacing "i.pximg.net/img-original/img/*/[pixiv-id].jpg/etc with "www.pixiv.net/member_illu...llust_id=[pixiv-id]"

* being the date in the url.

Edit: Also cross-checked a few images on danbooru itself and they do link properly there. Whether that was edited after the crawl or the bot is f-ing up, idunno.

Neither. Danbooru serves out the direct image link from its API, however on post view pages it automatically converts it to a contextual link. The link you're clicking is not the same link as the link that the bot is given, even if you were to do it at the exact same time.

Still no solution?..
Userscript: greasyfork.org/scripts/29...code/Pixiv%20link.user.js
Well, link should be greasyfork.org/en/scripts/29033-pixiv-link but "This script is no longer anonymously available on this site. Log in and check your Greasy Fork account settings." no idea what i should change in settings and where. lol.
Ofc, you'll need tampermonkey(chrome) or greasymonkey(firefox).

I'm wondering if this might actually be a problem on pixiv's end. I tried to go on today only to discover that images aren't appearing for me anywhere on the site at all. I noticed that they recently switched to https no more than a few days ago. Perhaps that may have something to do with this?

Images are working fine on pixiv. What might be happening is that Danbooru hasn't updated their API to recognize the new pixiv image URLs (i.pximg.net instead of i3.pixiv.net) and transform them to navigable ones when it returns them.

Worked great for me until the recent booru changes.
Edit: Ah, just changing "stats" to another div ID fixes it.