Who set up the SSRS instance? I would advise someone who is familiar with SSRS Security to set it up, to ensure it is done properly - security is not something you want to be flaky.
here is the documentation on SSRS Security:
http://technet.microsoft.com/en-us/library/ms156014.aspx
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
This thing is addressing problems that dont exist. Its solution-ism at its worst. We are dumbing down machines that are inherently superior. - Gilfoyle