This might be a stupid question but are you running the SQL 2008 client?

I have found that for some reason, a SQL 2005 Ent 64-bit cluster state cannot be seen by the 2008 client (even if the windows account is a local admin of said node and cluster).

Aggree with Animal that providing your a local admin of the server your connecting to (and assuming there are no client incompatibilities) the server state should be reported fine.