This bug has hit me. Looks like users with roles like vm user / power user cannot send “ctrl-alt-del” via the console even though they have the correct permissions. Our users cannot use ctrl-alt-ins as they are connected via RDP to a machine that has the console installed.
Looks like its a known bug and will be fixed in the upcoming VC4.0 update 1 sometime Q3 2009 :(
Luckily vSphere was setup in our pre-production environment – the machines i have running in production are still 3.5 with VC2.5.