photoshop interface question..

hi all.. i wasn't sure where to post this...

i used to be able to get to my

Image>Adjustments>Levels pallete..

but now whenever i click on that.. it only allows me to use my eyedropper..
and nothing happens when i use the eyedropper..
can someone help me get my levels back!? it was a tool i used often to lighten up photos and whatnot.. and i can't use it now.

thanks ahead of time for whoever comments..

Is this with one particular file or all files. Did you accidentally switch modes on the image? What version PS? Mac / PC?

If it's all images, even a small jpeg, you may have to look at reloading the software. Maybe someone else will have something you can try before it reaches that point.