Thanks for your reports! Does forcing Dx9 might help in some situations? On the Blizzard Application go to Options > Game Settings, check Additional command line arguments and add in -force-d3d9
It does sound like some older systems may be having a hard time with the changes made this patch. For those still experiencing issues, could you gather a DxDiag file? Copy and paste the text file created and paste it between two ~~~ like so:
~~~
DxDiag Here
~~~