I'm using Linux Mint 14 with MATE and I use Docky to open and switch between programs.
There's a strange glitch: File Manager (or File Browser or Caja 1.4.0 of whatever you wanna call it) refuses to open all together. The icon just bounces up and down when clicking on it, but the program won't start. It will not open by right-clicking and choosing “Open” either. I have tried deleting and repinning the icon several times.
This happens ONLY with File Manager. All other programs open and close normally. I have to open it from the Menu, then I can interact (minimize, maximize) with it normally through Docky. But if closed, it can't be opened again from the dock.