This problem should have been fixed with the latest build of 4.0b3 package, please download it and give it a try.
downloaded and installed but am still getting the problem and had to go right back to 3.3.22
got 46 copies of this in my email
"At [05/Dec/2008:15:52:51 -0600], web server with pid=11873 received unexpected signal=11, no core file is created. A new instance of web server will be started automatically!"
if you would like to take a look at it i'll send you the server login sometime between Friday night/Saturday to take a look