Why My UE4.11.0 and UE4.11.1 do not respont when I drop down some drop-down memu?

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Hi,
Why My UE4.11.0 and UE4.11.1 UE4Editer will not respont anything after I drop down some drop-down memu in Editor Preferences setting window or Details setting window ? I have to restart UE4Editer.exe. I installed UE4.10 and UE4.11, this never happened on UE4.10. My OS is Win7 Sp1.

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I need help!