Not registered as Safe

Aug 5, 2009 at 7:44 PM

I have had this webpart installed on our servers by the SP expert support technician. He has followed the documentation. The webpart is there but when I try to put it in a site I get the error message that the webpart has not been registered as Safe.  He is having trouble troubleshooting this.  Can you give me any clues as to how to fix this???  Please respond ASAP.