I'm using Linux Mint 14 Nadia, installed with iso file downloaded from linuxmint page. My desktop is Cinnamon, and everything is up-to-date. My problem is that when I point the mouse (maybe accidentally) to one of the two vertical boundaries of the screen, after around 3 seconds, it automatically switches to nearby workspaces. Wherever I am, in desktop, in a movie player or in a browser, etc., this always happens. This kind of action is really inconvenient because it interrupts my work. So how can I disable it?
Any help will be appreciated.