Slider doesn't work with my mouse,Slider doesn't work with my mouser

My slider gets selected with my mouse, but if I drag it, it doesn't change anything. It works with my arrow keys but not with my mouse, which is a problem. I double checked, there are nothing over my slider. I have deleted and readd the slider with no changes, it did not work either.,Slider doesn't work with my mouse. It does highlight it and selects the handle, and I can control my slider with my arrow keys, but with my mouse, it just doesn't work. I deleted the slider it did not work. There is nothing over my slider, I have double-checked it. Can anyone help?