...and another possible Mouseworks glitch Corky Brown reports that he could not get contextual menus to work in Mac OS 8 after installing Kensington's Mouseworks. However, many readers now report no problem in this regard.
Update: Corky writes: "The problem is solved. Seems I used the 'control-left button' for my slow cursor in the Kensington Mouseworks setup. Well that is the same key to be used for the contextual menus." Reassigning this key allowed contextual menus to reappear.