You might notice signatures are no longer showing up under posts. They're not gone; they're still shown in profiles, and you can re-enable viewing all signatures in topics as well.
I came across a strange phenomenon where one page in a topic was being cut off inconsistently; the signatures some people (including myself) have with 20k characters of chatlogs within spoilers seem to play a role in it. During troubleshooting I had disabled signatures for a bit to check, and frankly I loved how clean everything looked without all the images and banners unrelated to the posts, so I applied this fix for all users.
The phenomenon seems otherwise harmless, so if you want to see all signatures under posts again, you can go to Profile > Modify Profile > Look and Layout and uncheck "Don't show users' signatures."