Both in TC11_x64, TC11_x86, fluff 1.08 has a bug in auxiliary menus.Ex: mouse-right-click on ~/.ash_history, then open_with, then "more..." then ANY mouse click will close fluff totally.
fluff 1.0.7 does not have this bug (grab it and tested from TC10_x86); [Current: 2020/02/07 updated 1.0.7 -> 1.0.8 (gnuser)]