XF 2.1 Image Embeds no longer work. They appear for a split second and disappear and the BB Code goes away as well.

This morning I woke up to members complaining about image embeds not working. As far as I know, they were working yesterday.

  • I have an add-on by TickTackk that stops my image proxy from unnecessarily proxying images that come from HTTPS sites.
  • I am using the image proxy built into Xenforo.
  • Neither HTTP or HTTPS images are working from any domain.
  • This only applies to new posts. All old posts have their embeds working fine.
  • I have confirmed that my hosting company did nothing overnight that is out of the ordinary. I don't think any automated processes ran that installed or updated anything that would matter (just stuff like Softaculous or whatever).
  • I have disabled that add-on mentioned above to no avail.
This is on the brand new XF 2.1.3.

Does anyone have any idea where I might start to fix this?