Have a main report which links to various subreports. These subreports do not have default parameters and the parameters are required to be selected by the user before viewing the report.
The problem rises that the subreport tries to process and errors with "parameter is missing a value". The normal topbar is parameter missing and the view report button is missing. The report is launched from a link on a functional area.
The report works in report explorer and clickonce.
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.