John,
I'm truely sorry that 4.02 is not working for you. I have been using Hoster 4 in my shows since a few betas before the release date and it runs well. I've never had to use 3.40 during a show (five nights a week).
I'll never go back to 3.XX! EVER!
Here is my setup:
XP Home
SP3
Windows Media Player 11 (Never opened

)
Internet Explorer 7
All Custom Windows Updates
Latest Video Driver (Though the latest one did not work for the Nvidia card in my #2 test machine.

)
Vista has caused mega-problems for MTU. They just made a major decision. You can read about it here.
http://forum.mtu.com/showpost.php?p=78756&postcount=14
I feel your frustration, welcome to the world of PC's, BUT if we didn't have PC's we wouldn't have Hoster.
We'll get you going, hang in there.
Jim
