Mac Mountain Lion (Mac Version 10.8) shows a Computer Screen Box Problem
At the very end of my installation process for upgrading my laptop to Mountain Lion I suddenly found that my mouse cursor on my computer screen had an annoying black box associated with it. My son helped me determine that the installation defaulted with a system preference set incorrectly. If you find you have a black box following your mouse cursor all over the computer screen just go to System Preferences (top left corner of your computer screen and select…