I've run across a variety of situations both personally and on discussion threads where seemingly normal systems will suddenly start showing odd behavior, including slow application launch times, extensive login times, or just specific functions of a program (ie, menu access) not working. Many times bizarre system behaviors such as these in addition to obvious problems such as distorted or garbled text may be nothing more than a problem with fonts; however, tackling font problems can be one of the most tedious and frustrating ventures.