That is what can sometimes happen with driver updates. Many updates concentrate on incorporating bug fixes, code optimization, and increased performance. Unfortunately, what can sometimes also happen is that certain features no longer work as well as they used to in a previous driver incarnation (this can be dependant, to a certain extent, on hardware configuration). This can result in the update being withdrawn if the problem is reported as being widespread (as is the case with one of the NVidia graphics drivers about a year or so ago).
Hopefully, the next driver release will address the issue you've been having.