I'm wondering if the default configs got messed up somehow. We need more information.
Please do two things:
Pastebin your "Local_Extension" dialplan entry
Turn on debug level output (type "console loglevel 7"), make another call, then pastebin the output

See this page for more tips on collecting information and reporting it:
http://wiki.freeswitch.org/wiki/Reporting_Bugs

-MC