Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?
        - reducing number of workspaces (from 4 to 1) via the Tweak
Tool -> Workspaces interface in
        Debian Gnome Jessie;

 * What exactly did you do (or not do) that was effective (or
     ineffective)?
        - pushing the minus button;

   * What was the outcome of this action?
        - black screen with a button to "logout"

   * What outcome did you expect instead?
        - reduce workspaces ))

*** End of the template - remove these template lines ***