If it's a cache issue that's a long cache. I added a comment to this photo: http://community.dog.com/members/rwbeagles/photos/picture473688.aspx
earlier today (around noon maybe?) and it hasn't shown up yet.
Gina, do you have mod approval set up for comments on your picture? Maybe that's what the delay is?
Also, I'm noticing that there is a delay when I add to a thread on the forums. My comment doesn't show up right away...it is taking several minutes.
I am using Firefox and have the cache set to refresh every time I visit a page.