The best way to post a image is to post a link to it on your image server, something like flickr, smugmug, zenfolio, etc.
If you upload, make sure your image is no larger than 800 X 800 pixels. Normally, a image that size will be a small file, about 300KB. Its likely that your image was somehow corrupted during the upload and jammed things up, since CR usually reduces oversized images up to 4mb.
Create a duplicate of your image that is reduced to 800 X 800 and give it a different name. Try with that.