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Question: scaling problem for external UHD monitor

After I installed 10.13.1 a week ago, I am having a problem for my LG UHD monitor.

Scaling function is not working.

Monitor works only for few options :

3840 x 2160 (low resolution)

1920 x 1080

1600 x 900 (low resolution)

1280 x 720


with 30 hz option only......

Before 10.13.1, my monitor was working fine with other options with 60hz.........this driving me nuts.

I tried to use switchresX, but it crashes whenever restart...

any solution?????????

MacBook Pro TouchBar and Touch ID, macOS Sierra (10.12.4), (Retina, 13-inch, Late 2016)

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User profile for user: TWon2013

Question: scaling problem for external UHD monitor