Their are 2 new important improvements added.
Improved hardware monitoring module: * Added generic support for Logitech G15 keyboard LCD display. *Added protective technologies aimed to jam unsafe memory scanner of PunkBuster anticheat system and this way prevent this anticheat system from crashing graphics hardware when RivaTuner resides in memory.
Lots more to it here
http://www.guru3d.com/index.php?page=rivatuner&menu=8
Download here
http://downloads.guru3d.com/download.php?det=163
apperently punkbusters new update was causing huge problems with rivatuner so this new version should fix it.