I use two monitors on this Macbook Pro running Mavericks. I never use more than one "desktop", however once every few days, I see a random number of new desktops created - usually between 2-3 but sometimes there are as many as 7-10.
The desktops do not remove themselves so some days I end up having more than 12 spare desktops.
There is no wallpaper or icons on my desktop.
What causes the new desktops to be created spontaneously?