Issues with Proc::ProcessTable module on Solaris 9

Hi,

I have a script using Proc::ProcessTable module to read process table
and report stats. The problem is the script hangs when reporting on
CPU percent. I'm using 'pctcpu' method to get the CPU utilization.

It works fine on other systems such as Linux or Solaris 10.
Is anybody aware of issues with Solaris 9.

Thanks in advance.
Rajesh