Have you tried deleting your 6.0/prefs folder? Backup the directory, then delete it and let maya go back to default settings. If that fixes it you can copy things like your shelves from the backup into the new prefs folder. You can also do wireframes using the vector renderer. In the render properties set it to Fill…
Neither the hardware renderer nor the 'high quality rendering' in the viewport ( displaying spec, bump etc ). I posted this a couple of days ago on cgtalk with no response: "So, it seems my hardware renderer no longer functions correctly. ( and I really need it to render wireframes ). Whatever I do, it only renders objects…