Comment 6 for bug 826089

I don't know unity-2d that well, just started using but -
It appears that 2d defaults to 4 ws's and doesn't need/create that gconf key but will use it if it happens to be there

On the other hand Gs creates the key and sets the value based on active ws's when logging out, but does not actually use the key/value when logging back in
Ex. if one logs out of Gs with 3 active ws's then the value is set to 3. When logging back into GS only the default 1 ws is available.
Meanwhile 2d will show 3
So the fault seems to lie with Gs for writing a value to a key it doesn't appear to actually use.