When trying to launch phpsysinfo from a browser : http://localhost/phpsysinfo/
we first get a redirect to http://localhost/phpsysinfo/index.php?disp=dynamic
with a "Loading... please wait!" html message
then an alert popup "Error loading XML document" and nothing more.
Looking in error.log we found the cause of the problem :
Use of php deprecated function "split()" -> error
This function has been DEPRECATED as of PHP 5.3.0
So replacing split with explode seems to solve this..
An outdated patch can also be found in the Debian bugreport