Images seem to work fine now after the 19.4 upgrade.
Except when posting images via direct upload. I've tried to post an image with body description a couple times now to another community and as soon as I hit submit, it just instantly removes the image and doesn't post anything, leaving me on the create post page.
Edit: Pretty sure this is a front end bug as I had to hit submit twice to make this post. When you hit submit it jumps to the top of the page first.
There are currently some front end bugs with the default UI since the update to 0.19.4. Crossposting is also broken currently. You can try a different front end for now, they seem to be less buggy.