To prepare for a server upgrade, I've just uploaded some new code that prevents embedding images from other sites in this one. (That's because if people embed images from other sites, it will cause connection errors to some visitors.)
You don't have to do anything -- the new code handles everything. Images that are pasted into the forum from other sites will be converted to links. If you want to display the image, upload it instead of hotlinking. I'm just mentioning it here because old posts that have hotlinked images will now just have links to those images.
All you have to remember is that if you want to put an image in your post, use the image button and upload rather than hotlink.
If anyone has any questions, let me know below. Also, let me know if any formatting looks weird.