Why won't my Corridor Objects Toolbox open?

I cannot get my Corridor Objects Toolbox to open. It was working a few days ago, but now I cannot get it to pop up. I have tried it in several different corridor model dgns. It is all the same result. I will click on the tool and then select the corridor and nothing happens.

The dialog at the bottom of the screen acts like I have opened it normally, but alas there is no difference, and I am still unable to edit my corridor through the corridor objects toolbox.