I'm not sure either and I don't have a problem running 4.53 over Cisco VPN with RDC - have not tried the 4.60 version.

Maybe his code, or maybe something else he's running that we don't run that is causing an issue. Only takes a minute to try a different version of KiXtart though to see if that's the cause. If it too has an issue then probably need to post the entire logon script to see if someone can spot an issue.