Found this thread, but its fixed, and I have the same issue..
I have Xenforo 1.4.5, Windows 8.1, IE11 and don't see editor when replying to thread. There is a field to post the text itself, but no buttons to format the text, insert hyperlinks etc.
I use Xenfocus Fusion style but the same happens when I use the default style.
jquery is jquery-1.11.0.min.js
Don't have any plugins install.
Talking about the Tchaikovsky forum.
If someone has any suggestions - will be vary thankful!