Same here. VEP is so unstable I don't know if it is problem of my DAW, LAN connection or my slave machine. I am using VEP (v4.1.8008) on both my PC. Server running Cubase 6, windows 7. When I start up Cubase I can ALWAYS connect to the slave; but after I work for a while, when I have used many VSTis, then when I load the file the next time, VEP will disappear on the server interface.However I can always find the VEP started on my main computer - the DAW computer. And the strangest thing is, if I leave the computer idle for half an hour or so ( sometimes ), the slave VEP would mysterious appear on the list again. The performance is so sporadic and temperamental, it is frustrating. Imagine loading a file in front of a client and such things happen!
Are you using fixed IP on all machines?