In the 1.8.602 update the following change was made.
- Community Projects Forum posts may now be edited by the poster after more than 15 minutes.

When I go to edit a post, it informs me that "Posts may only be modified or deleted for 15 minutes from their time of initial posting."

I've experienced the same issue. I can see the edit and delete buttons, but when I go to edit a post after the 15 minute period has expired I can't. Still see the option though.

Humm. We'll take a look. We're a little mired in a major server project though, so this might be a sec.