I don't think it's that. I could see the edit button for the comment you replied to, but now it's gone, and it's been a fair time; the previous comment is also uneditable too.
Originally Posted by GreatEmerald
Ah, if I click on edit, and then change the URL to reference the previous comment, I get this:
The administrator has specified that you can only edit messages for 5 minutes
after you have posted. This limit has expired, so you must contact the
administrator to make alterations on your message