Upgraded SQL Server to 10.0.5826 and now current sessions and history are totally blank.
Microsoft SQL Server 2008 (SP3) - 10.0.5826.0 (X64) Sep 18 2012 03:07:34 Copyright (c) 1988-2008 Microsoft Corporation Enterprise Edition (64-bit) on Windows NT 6.1 <X64> (Build 7601: Service Pack 1) (VM)
Update to latest build of PA agent available for download from here
Performance Analysis version 7.0.443 or later has been confirmed to work, however PASS 7.0.463 was specifically created to address the 10.0.5826 SQL Server version.
Please upgrade middleware agent first, then the collector agent.