Resolution disappeared!

[turugara]

I have the DisplayLink product by Newer Technology, USB to DVI/HDMI/VGA display adapter. My monitor, a Soyo Topaz S 24" monitor with 1920X1200 Native resolution, is connected to my Macbook Pro, Unibody 2.4Ghz Core2Duo, via the DisplayLink product.

It was working fine and displaying at the 1920X1200 resolution fine until today.
I restarted by Macbook Pro and now, the maximum resolution on my 24" monitor is 1440x900. Just yesterday it was displaying 1920x1200 just fine.

I thought the driver was the issue so I uninstalled the DisplayLink Driver and reinstalled it, twice.

Both times, the resolution was still capped at 1440x900.

I know for a fact that my monitors native resolution is 1920X1200 and that this product displayed it at 1920x1200 just fine until yesterday.

So what's the problem? How can I force the displaylink product to display at 1920X1200?

Current resolution's available are
0x0
0x0 (stretched)
640x480
800x600
1024x768
1280x720
1280x1024
1440x900

On a final note, my Main Monitor (i.e. the one with the dock displayed) is still my macbook pro's monitor. This 24" is my secondary monitor.

[Carlo]

If you are on Snow Leopard you can try deleting the following files:
/Library/Preferences/com.apple.windowserver.plist /Users/YOURUSERNAME/Library/Preferences/ByHost/com.apple.preference.displays.SOMECODE.plist
And rebooting.
Also rebooting in safe mode (keeping shift pressed at startup) could help.