The display and drop part works, but can't change any options cos the menus dun work.
The GarbageFu menus work fine with FuBar 3.5. They also work fine if you go completely without FuBar and access them through its minimap button. The minimap button appears appears automatically via the FuBarPlugin-2.0 library if you don't have FuBar. No menu problems.
As HunterZ said, if you prefer to access it through your LDB mod instead of the minimap button, the latest FuBar2Broker should fix the second level menu issue with such mods (I haven't tested it yet).