Textboxes Not Working

Question

I have a WPF browser application that is utilizing a ReportViewer control to display SSRS reports.  After printing one of these reports using the print function located within the control, the textboxes throughout the application will stop working.  Even if the user opens a new page it will not allow them to type in the textboxes.  The dropdown list, datagrids, and buttons still work fine.  I have been attempting to duplicate this issue with no success and it is extremely intermittent for the users.  I have found that if they open the application in a new tab it will work fine.  Does anyone know that could be causing this issue?