Folders in Dock Won't Open

I have my home folder and application folder in my dock but for some reason I can't get them to open when I click on them. I can right click them and see a contextual menu of their contents but if I click open in the menu or just left click the dock icon nothing happens. The same thing goes for my Trash. I can right click the dock icon and empty it but I can't open it to see what's in the trash. If I logout the problem goes away when I log back in, but eventually it occurs again. Anyone know what's causing this?

Regarding the Home/Application folders in your Dock, have you tried removing them and then adding them to the Dock to see if this changes anything?

Regarding your Trash problem, I haven't come across your exact issue before but this article might shine some light on how to fix things.

These problems seem to be all related to the Dock plist.

Did you try trashing that file and then restarting? Might help. The path is this:

Macintosh HD -> Users -> your user account -> Library -> Preferences -> com.apple.dock.plist

Let us know how this goes.