But your only using two desktops - so no reason to panic just yet.

Reset to the maximum number (probably 16 or 24 - some small 2 digit number) and **then** fill up all of the systray lines.
Don't forget to shade the windows until none of the desktops have a bare spot to open another one - -
At that point, you can just sign in again with another username and repeat.
= = = =
In my case, usually at that point I can hear that the window with the movie or tv program playing in it has reached the point I want to see - but I can't find the tv window to watch.
Aren't x11 desktop managers just great?
The majority of the world of users are stuck with just a single desktop view.