Member Rara Avis
Not a bug, Ed, so much as a design decision. Unfortunately, it's very difficult to allow Topic Review and still maintain the security of a Private forum. It would provide another "doorway" through which Private topics could be read, and the more doors that are available the harder it is to insure they're all correctly locked. It's a decision that was implemented by the original writers of our software and one I've never found the need (or time, I guess) to investigate further.
If it's inconvenient for you, I suggest right-clicking on the "Post Reply" icon and opening it in a new window. That way you can, if needed, move between two windows to read the topic as you reply.