The image loader does not work properly in my current WordPress installation. Initially it would load - but took ages to do so. When loaded I uploaded a properly sized image 500KB or so. It gave a fatal message, but the image appeared in the gallery. When I went to install it in my post, the only option I had was full size.
I deleted the image. Closed everything, relogged on and tried again. This time it wouldn't even load the image loader.
I tried this process with another site. Everything worked fine.
What should I do?