I've just updated to the latest MP Pro on my 3 systems.
Primary - Windows 7 x64 Ultimate
Secondary 1 - Windows Server 2008
Secondary 2 - Windows XP Pro
Things work fine on the primary and Secondary1 (except for known ctrl-alt-del issue on 2008)
When trying to use secondary 2 it will get a connection and lose it, get connection and lose it, rinse and repeat.
Prior to this update it was working just fine.