We are trying to disable the automatic wildcard option in Civicrm (Wordpress 4.7.2). However, when we try to disable the option and save we get an error that says “Save Failed: DB Error: Unknown Error”. I tried to disable the automatic wildcard option in the main 4.7.2 Wordpress demo installation of Civicrm and it saved with no error message. We contacted our hosting provider who enabled "Enable Debugging" and "Display Backtrace", and they stated that they could not determine what the issue is without manually debugging the code. They recommend that I ask the Civicrm Stackexchange team for help.