Plugin not working

[Gabbalo]

Hey there, the plugin is currently not reacting to anything (but collapsing/expandinng the - empty - lists). Save/Save As/Load/Load From does not produce any kind of file management dialog or any kind of reaction. Both, disabling and reinstalling, doesn't help in this issue. The installed version is 3.7.3 as published here. Anything I can do to make it work again? Help is very appreciated.