Adam,
I am using version 5.2. I cannot reproduce the problem on your example page. I included a screen shot with this post so that you could see what I am talking about. The width and height are zero when I first upload this image, as you see in the first screen
If I upload the same image again, the width and height appear as normal. I checked my security configuration files and found that the image gallery file path was still pointing to upload. I changed that to point to my image directory but that had no effect. Hope this helps