From: Paul Vriens
I'm making some changes to the TestBot infrastructure. This "The specified guest user must be logged in interactively to perform this operation" error did occur before, but it seems it's more prevalent after I upgraded the hypervisor to ESX 4.1. This might take a few days to resolve, for now just ignore that error message.
Could these changes also explain the new ntdll:exception failures:
Yes, I guess that's possible.
Greg.