Thanks lanux! I tried that before. Actually, if I let Word recreate a new normal.dot, the tooltips will reappear, but only for the newly created documents (using the new normal.dot). I guess I could reassign this new normal.dot to the old documents, but... that would create a real formating mess. Between these 2 evils, I'll choose to have no screen tips!
There might be another solution though, but it seems that my templates are somewhat corrupted. I'll try to see if I can purify my old templates... I'll try the VBA Code Cleaner and other stuff...