I have the same problem. Driver seems to have rebooted randomly and since then native resolution 1680x1050 is no longer available on my main monitor.
Windows 7 64bit.
ATI Mobility Radeon HD 4670 (latest drivers)
Running USB ViBook on second monitor
Both monitors are identical.
ViBook connect with DVI (no problem)
Main monitor connected with VGA directly to laptop, this is where
native resolution 1680x1050 is no longer available (used to be)
the EDID of both LG W2254 clearly state 1680 is supported however it is not shown as available to select for main monitor.
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