Layers Not Displaying in Layer Panel

I am having an issue where my layer panel is blank, not displaying any of my layers. I have tried closing the panel and reopening it and I have also tried different files but have been unable to fix the issue. Has anyone else encountered this problem or does anyone have an idea for a fix? Thanks!

Hi Evan- try right clicking on the layer list header, just below the icons at the top and see if any of the available columns is checked.


Thanks Pascal, that was the problem - for some reason Rhino was opening with all of the columns unchecked.