it was my experience two weeks ago, when Report Server was only displaying down to the orange/blue line, no admin controls, no menus. Restarting the services corrected the first problem. The DB had been stepped on, and a restore was required; but, nothing below the line was visible until the services were restarted. SSRS certainly is not the best product, and it is Microsoft. Not restarting, in most circumstances, is foolish.