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Since gnome-shell version 3.18, there are no 'maximize' and 'unmaximize' signals any more, but only a single 'size-change' signal. This makes window-buttons fail to load with an error message about the lack of these signals as long as it is set to only modify maximized windows.
The dash-to-dock extension also encountered this change in commit 4eadd6eba8c2104a3b203ff86a115a1723e9b7d7. I took their solution and ported it here, which works fine for me so far.