After the update to the deck image generator, you just have to redo a post that has ??s in it. The previous images won't change automatically.
That's not actually 100% correct. The issue here is that those older images have been built, and now instead of re-building them, the server just uses the old ones.
I can fix this by deleting all old images on server, forcing it to rebuild everything. Problem with this is that there are so damn many of them that it requires some manual labor to get rid of them all. Simply going to a folder and deleting everything won't work in this case.
I'm doing it as we speak. Takes a while but should be done today.