Hi Rajani,
It is recommended that the same version of the Citrix client is installed on Vugen, Controller and Load generators machines. The Citrix client settings should also be consistent.
For more information please refer to the LoadRunner User Guide for the LR version you are using.
You can download LR 11.52 User guide from the following link:
http://support.openview.hp.com/selfsolve/document/KM00419380
Kind regards,