The SharePoint site with the id {GUID} could not be found. (rsSPSiteNotFound)
The source farm reports work fine, but after the restore to a new farm, some (not all) reports get this error. Looked at many blog posts and they all seemed related to BlobCache. Not using it currently. In the web.config, I ensured that the blobcache is set false.
This is on SharePoint 2010 with Reporting Services 2008 R2 in a multi-server farm