Nvidia earlier this week released the new GeForce/Ion drivers (opens in new tab) version 196.21, which added SLI and multi-GPU support for many new gaming titles as well as upgraded PhysX System Software to version 9.09.1112. But as with any new software, there's always the chance of a bug that'll cause some unintended results.
Enthusiasts who like to overclock quickly found that their once trusted overclocking software didn't work as it did in previous versions. Specifically, tweaking software RivaTuner V2.24C, EVGA Precision V1.9.0, and Galaxy MagicPanel HD all had problems in managing at least one of the core, shader, or memory clocks, according to Expreview.
Nvidia today confirmed with Tom's Hardware that the driver's behavior with overclocking tools is indeed a software bug and that an updated driver package is being worked on at the current time. Stay tuned.