Hey guys.. There is a bug that just manifested with the changes we implemented in the forums (sometimes these pop up in spite of our best efforts!). Right now users are not able to go back and edit their message posts (this applies to replies to a topic, not the original message). We are aware of the issue, and it should be fixed by tonight.

I apologize for the inconvenience. Thanks for your patience,

Jennifer

EDIT: this has been fixed 9/27