I also installed MAUi based on MAUI Installation on Torque and xCAT
After setting up the configuration, and testing with sample qsub
$ echo "sleep 30" |qsub -l nodes=2:ppn8. The MAXPROC limits in MAUI does not seems to work.
The solution I found later on is that I made a mistake of starting service pbs_shed start before service pbs_server start which cause the MAXPROC in MAUI to stop functioning. When I started service pbs_server only, the MAXPROC in Maui works. strange....