PhpInfo Problem

I don't know if this is documented or not. But I compiled 4.0.0 on Redhat 6.1 as CGI and everything seems to work ok, but there is a funny thing that happens when I use phpinfo. When I call it the page displays everything ok except for the table where it says "This program makes use of the Zend scripting language engine:", that always displays fine, but some times the text underneath it (Zend Engine...) does not appear, instead some strange text. This does not happen every time and I can't reproduce it reliably. Does anyone else see this? Thanks. Michael