M src/fluxbox.cc → src/fluxbox.cc

@@ -936,6 +936,7 @@ //   1) unmapping the window (which leads to the upper branch
     //   2) sends an synthetic unampevent (which is handled below)
     } else if (screen && ue.send_event) {
         XDeleteProperty(display(), ue.window, FbAtoms::instance()->getWMStateAtom());
+        XUngrabButton(display(), AnyButton, AnyModifier, ue.window);
     }
 
 }