Just installed v. 4.6 and all seems to be working well except that, and I am following the instructions in the provided help area, once I select a room (it's a single, 4-walled room) the Modify Room function in the Plan/Modify Rooms drop-down remains grayed out and unusable.

I'm sure it's something simple but I cannot find the answer.

Any clues appreciated. (My end goal is to get that window that allows me to create floors/textures and ceilings as well)

Thanks!