Could you capture your entire screen with the layers panel open and any collapsed layers, expanded so we can see them?
Ok, take a look at the tab at the top of your canvas. It says quick mask. You need to hit the q key to get out of quick mask. Then all the options should be available. If not let us know.
As for collapsed layers, there are several ways this happens. Adding any styles to a layer, will auto hide the styles used.
If you group the layers, the group it self can be collapsed, hence hiding the layers.
Moving the top of the panel down will hide any layer that won't fit in the space.
Technically collapsed is not a good term as in this case has several meaning, but is generally the quickest way to respond. I apologize for any confusion.