When you are viewing reports from a SharePoint document library, if you click Cancel while a report is loading, the Apply button in the parameters pane will no longer work. The Apply button is enabled but clicking it will cause no action and the report will not reload with the updated parameter information.
Click the refresh button on the report viewer toolbar. Then make the changes that you want in the parameters pane, and then click the Apply button.
Ed Price MSFT edited Revision 1. Comment: Title and tag updates.
Craig Lussier edited Revision 2. Comment: added en-US to tags and title