Hi, tried to verify the difference using the MacOS and Linux clients (4.6.8) connecting to CentOS 6.5 and the default NX server from the distribution, but could not suddenly see any difference between the MacOS and Linux clients, contrary to reported first. With both clients, I got new sessions directly on the host.
HOWEVER, when I reconnected and did “Reset login information and preferences”, suddenly the session list appeared. This worked with both clients to the same host.
To me this seems not really consistent, but until I see it again and can repeat it, it is hard to complain on otherwise a very nice product!