There have been several reports of menu titles disappearing in the ClarisWorks word processing environment, specifically the Format and Style menus.
There does not seem to be one cause. However a few patterns have emerged:
The issue only occurs if you switch to another application which has a fewer number of menus than the seven that ClarisWorks WP has. When you switch back to ClarisWorks, the Format and Style menus are missing.
Several extensions seem to be related to the problem, all of which modify the menu in some way. MenuMaster, Disk Doubler, Directory Assistance, Now Menus and Caps Lock extensions have all been reported as suspects.
Workaround:
Opening a document in another ClarisWorks environment and then closing it reestablishes the Format menu. You can also close all WP documents and reopen a WP document.