Hi,
What is the protocols used for the Vusers scripts?
What is the CPU usage before and do you receive any error messages before the Controller hangs.
Please note that CPU usage should stay below ~80-90% continuous usage.
For additional instructions please also review the following post http://h30499.www3.hp.com/t5/LoadRunner-Support-Customer/LoadRunner-Support-Tip-How-to-calculate-the-load-generators/m-p/6358699#M1131
Kind regards,