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Deinstall the UniVGA3 driver completely and reinstall it again after reboot. It's sometimes needed to get rid of the old driver to get the higher resolutions working.
seems like SIS doesn't support any of the exotic resolutions like 1366x768. widescreen 1440 and 1680 is the most exotic they can get obviously. time to get a new vga or try the linux driver.
If you email me include [WIMSBIOS] in the subject.