To fix the following error in SharePoint 2010 I used the steps outlined below. My setup was a Single Sharepoint Machine with NO Active Directory:
Unable to display this Web Part. To troubleshoot the problem, open this Web page in a Microsoft SharePoint Foundation-compatible HTML editor such as Microsoft SharePoint Designer. If the problem persists, contact your Web server administrator.
Then in Central Administration follow these steps:
- Go to Application Management >> Alternate Access Mappings
- Choose the correct URL from Alternate Access Mapping Collection (Page Left)
- Click Edit Public URLs
- Enter Intranet & Internet domain names
- Click Save