3dsMax 2011 - Crash when loading render preset

Im experience constant crashing by just loading the presets via vray settings tab, also by changing the max subdivs on adaptive image sampler (only when i work for a while and then set the render parameters, it not happen when i just open the file and tweek the settings);and when using the slate material, right click, materials, vray…it just take a few seconds to show up the options to the diferent vraymat choices.
Im on 3dmax 2011x64 and vray 3.15.01_25196 nightly.
Not sure if its related but i have send my video card to repair its a GeForce GTX 650 TI Boost.
Any hints?