Broken links. List of feature suggestions for Renoise contains many examples.
The links work just fine when getting opened in a new windows, as we’re redirecting them (try control clicking them or copy paste the links into the browser). When used internally they don’t. That’s indeed annoying and there unfortunately isn’t an easy fix available: https://meta.discourse.org/t/permalink-normalizations-dont-work-for-internal-links/57899
Missing images in posts.
Not sure why this one is gone now. In general attached images and linked old images should still be present.