When you launch iReport, you see a warning that the license has expired or will expire soon:
The evaluation license you are using is expired and is no longer valid.
To buy a commercial license, please visit http://jaspersoft.com/jrprolicense.
If you continue to work with iReport without a valid license, some components may no longer work correctly.
Download the attached license file. Click on "Install New License" (in the previous screen shot) and point to the license file.