Right click doesn't work in SMC

We are directly accessing the SP on the vmax and i'm using mac OSX Lion to work in my office. Everything was fine till few days back, but suddenly today when i try to allocate storage to the server i discover that "right click" doesn't work in SMC. No matter wherever i right click drop down menu doesn't pop-up or unable to select the option even if it pops-up. Can anyone know whats causing this all of a sudden.