Some month after releasing version 2.7, NVIDIA has prepared new 2.71 version of PhysX plug-ins for 3ds Max (2009-2012) and Maya (2009-2012). As usually also this updates bring many improvements and fixes some bugs. New PhysX plug-ins for 3ds Max fix a HW check issue for old driver causing crash for some users such as fix the crash with previewer, waving flag sample. This release also increases contact buffer for PhysX 3.x. New PhysX plug-ins for Maya brings toolbar improvement by switching to single click pops up menu instead of right click. Double click executes default behaviour.
This change is because newer releases of Maya have trouble with toolbars overriding right-click. All of these upgrade 3.x mode to use PhysX SDK 3.1.1 and much more. More details about 2.71 PhysX plug-in for 3ds Max or Maya such as download link to Developer Support Center you can find if you follow link below.
Source: Physxinfo