PHP Exit; does not work

I'm working on 开发者_如何学Ca client's server and am finding the strangest things..

echo 7;

does not output 7.

echo "hello";

outputs hello.

and the exit; command does not work.

He's running 5.2.13 and Apache 2.0 Handler and has the Zend handler installed...

Anyone have any clue what might be going on?

this might sound stupid, but maybe phpinfo(); could give some hints?