MAC ONLY
The Mac AC3D 7.2.17 distribution was missing a file which would cause the Tools->Create-2D/3D-text dialog to not show.
If you are using the Mac version of AC3D, we recommend you download AC3D 7.2.17a. This includes the missing file.
www.inivis.com/downloads.html
If you don't want to re-download the Mac version of AC3D again and already have 7.2.17, download the attached file (ac3dttfont.tcl) and place it in the tcl folder, which is within the ac3dmac folder. This will restore the functionality of the 2D/3D text creation.