seg fault/invalid pointer in apache error logs

I've installed SWSoft's Site Builder. It installs to
/usr/local/sitebuilder with the website in the htdocs folder.

When I access the website, I get a lot of blank pages, then if I
refresh it will work. But if I look in the apache error log, I see

----
free(): invalid pointer 0x86b0b98!
[Sun May 28 22:44:33 2006] [notice] child pid 11951 exit signal
Segmentation fault (11)
free(): invalid pointer 0x87a15c8!
[Sun May 28 22:44:57 2006] [notice] child pid 30516 exit signal
Segmentation fault (11)
[Sun May 28 22:44:58 2006] [notice] child pid 30620 exit signal
Segmentation fault (11)
---

I only get this with this script, and not with any other php scripts.
I've contacted SWSoft, and they said "Most likely, it is a PHP issue.
Try to recompile PHP if this happens again. "

Which I have, multiple times! Could this be a problem where it is
stored (/usr/local/)? Should I try moving the folder to under /home? Or
is it a problem with the script itself, they're just blaming it on php?

Just wanted to get your thoughts on this, if anyone has ever seen/dealt
with an invalid pointer() before.

Thanks!