Have tried the following procedure, which did not resolve the issue for all of the Portlets on the Home menu:
This can happen if the user's current homepage is corrupted or no longer is valid.
All Supported Releases
Reset the user's homepage to the default:
1. As an Admin, go to Administration->Organization and Access->Resources
2. Filter for the user with the issue, and click on the link to the user to access the Properties tab
3. Click the "Reset Home Page" Button