Hello,
The description you've provided is pretty general. In order to help you you will need to supply additional details.
1) How are you inserting the web part?
2) Are you using the portal engine or ASPX templates?
3) Is your web part working outside of the
CMS?
4) Is there any error message displayed (please also check the Event log)?
5) Could you please post screenshots of your web part properties and paste the web part code (codebehind and the aspx file)?
6) Have you followed our
guide?
Best regards,
Boris Pocatko