Why can't I post a comment to the photos? I haven't been on this site for about a week and I would love to tell someone how beautiful their cake is and I don't see where to do that.
Some members do not allow comments on their photos. Additionally, the site has been revamped recently and there may still be a bug or two.
Make sure you're signed in. You can see everything even when you aren't signed in, so you might think you are and you aren't. This happens to me if I haven't been on the site for a few days. Usually my computer opens the page and I'm signed in, so I don't really check each time and don't notice until I try to save a picture or make a comment.
Also, commenting on the contest photos is turned off until after the contest.