This article troubleshoots an issue that occurs when the option "Show the Start screen when this application starts" option for Excel is active.
When a user is assigned to Report Player opens a report, the application finishes authenticating the user, and the user clicks the Report tab, the tab is blank with no parameters or a Run button.
This is caused by the user having the "Show the Start screen when this application starts" option checked in Excel > Options > General. The Report Player window actually opens up in a window behind the report. The Player window may not be visible in the window behind the report.
Uncheck that box and whenever a report is opened, the Report Player window should appear correctly.
Report Player Designer 4.6