We have been having a lot of computer shut-downs with patrons using Yahoo! Mail. I found that the patrons are invariably using Yahoo! Mail Beta, a trial for a new format of Yahoo! Mail. If they try it out once, they are automatically logged into it every time. I encourage them to go back to the tried-and-true older version of Yahoo! Mail until the new version is %100 ready. They may have to go into "options" in the upper-right-hand corner.