The reportviewer shows the report in HTML preview. when the report contains several pages and the user clicks on the print button he / she gets the print dialog , after clicking on the print button from there the hard disk shakes, rattles and rolls but 4 out of 5 times nothing comes out of the printer.
this behaviour has been noticed on several pc's now and most often when the number of pages in the preview is different than the real number of pages to print.
Also the print dialog takes a long time before it appears.
Jan D'Hondt

Reportviewer fails to print 4 out of 5 times
Elizabeth Maher MSFT
See this thread. Will be fixed in a service pack sometime.
http://forums.microsoft.com/MSDN/ShowPost.aspx PostID=177732&SiteID=1