Process Explorer v15.22: This release addresses a bug that caused Process Explorer to crash when viewing .NET thread stacks of 64-bit Windows XP and 64-bit Windows Server 2003.
http://blogs.technet.com/b/sysinternals/archive/2012/07/16/updates-handle-v3-5-process-explorer-v15-22-process-monitor-v3-03-rammap-v1-21-zoomit-v4-3.aspx
Process Monitor v3.03: A bug that caused some symbols to not resolve in stack traces is fixed in this release.