'Unable to read from thread kernel pipe' error in Apache

[Will McCutcheon]

Okay, I'm a bit confused.  You say that I should run Apache prefork if I want stability, but I'm already running prefork (at least as near as I can tell: see my last e-mail).  Additionally, my install of the php4 port doesn't appear to be threaded:

$ ldd /usr/local/libexec/apache2/libphp4.so 
/usr/local/libexec/apache2/libphp4.so:
        libcrypt.so.2 => /lib/libcrypt.so.2 (0x28252000)
        libm.so.2 => /lib/libm.so.2 (0x2826b000)

I expect that I'm misunderstanding something somewhere, but it seems to me like I'm already doing the things that are being suggested.  Can anyone shed any light on this?  Thanks so much for everyone's help, I really appreciate it.

W