Windows Update pushed out a new video driver for the Mobile Intel(R) 4 Series Express Chipset Family. One HP 6730b laptop was updated from 22.214.171.1242 to 126.96.36.1991. After the update the color depth is reported as 8-bit even if the setting is 32-bit. This means that Areo effects are disabled.
Downgrading to 188.8.131.522 did not help.
Is there any way to force the video driver to report 32-bit color depth?