Create a report with the % character in its name.
For more information, see the documentation topic Create a report.
On the report homepage, search for the % symbol.
Click on any report from the results.
Try to export to PDF.
Note that the dialog window does not work.
Don't include the % sign in your search on the report homepage. For example, if your report is named "Incidents fixed 100% by Support," search for "Incidents fixed" rather than "Incidents fixed 100%."