My 2 cents.
First check USB, now if it is a hub and you are plugging it into the same hub and same position as before it still may not work because of 2 reasons.
1) increased load on the hub from other hardware plugged into the hub.
2) errors that occur with usb ports that can affect some hardware but not others due to corrupted, conflicting drivers or whatever (I can't remember exactly I did research on it a long-time ago) so try changing the port.
Also
3) try buying this hub and use 1 of the 2 high-powered ports (I did this) - Targus 7-port USB Hub
4) If you updated your graphics drivers try uninstalling Matrox, shut down, start-up, redefine your custom resolution, choose this resolution for windows then shut-down, start-up, check resolution was "kept" then reinstall Matrox.
In other words try to fix each and every problem with your PC first.
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