Color Range slide bar greyscaled issue.
Hi everyone.
I'm Louis, and here is a question that already drives me mad, which is that I can't adjust slide bar of Highlight option in Color Range. Please see image shown below.

I'm using Chinese version, so you might get a little confused about the UI, but it's the same as Eng version. The red frame indicates Highlight in Chinese.
As you can see, the slide bars are all greyed scaled, and I have been trying to make it work with some tweak, including change photo bits and some other methods, but just won't work. Please help me deal with it.
Much appreciated.
