[Ss3] Is there a way to substitute and alternative Main Task in the Tasks dialog box?

We have been working with configuration variables to isolate non-user DGNLIB's from system/site DGNLIBS so that in the customize dialog box, the File menu only displays the user's GUI DGNLIB's. Somehow, we appear to have replaced the Main Task with a Print Preparation task. If we try opening the Main toolbox from the tools menu, or set the task dialog box to the top Tasks, We see a Print Preparation toolbox and not the Main toolbox. The only way we can open the main toolbox is to use the Toolboxes dialog box and set the option to tasks and then we can select the Main in that list to open a Main task/toolbox.

Does anyone know what might cause this to occur?