Sorry about the image issues. We know about the issue, and Kaity will be looking at it today. Our matrix instance came under a pretty serious attack by transphobes this last week, and keeping it safe has been our big focus, so this has sort of lingered.
I believe so. Kaity has tried a couple of quick fixes, but it's still an issue. We'll be upgrading soon though, and will get it fixed when that happens!
Really? I can view posts with catbox images and have a recent post with a catbox image that other people could see :/
I remember reading some countries dislike catbox.moe so perhaps your DNS blocks them?
Could you try temporarily switching to another DNS to see what happens?