Do not change Drupal settings if you don't understand what you are doing

Twice we have had someone with high privileges change settings that made things not work properly. If you don't know, don't play, ask Walt for help, please!

Here is some specific guidance:

Do NOT change the settings in Pathauto.

The setting in question is what to do with the paths as an update action. The right answer is Do Nothing. They have been changed from the default for reason and must remain that way or you break links. The wrong answer (which might seem right to someone) is Create a new alias.

Don't play with aliases unless you are sure you know what you are doing! If you do need to change one, with the update action set as above, you must uncheck the alias box on the edit of the page, retype the new alias and save.