Your installation looks correct, withe the latest version.
For whatever reason, there seems to be an issue with the load sequence of dialogs. Some events seem not to be received, hence the partial display of dialogs.
Could you open the Ruby console and copy/paste the following command (and then press Enter).
UI.openURL File.join(LibFredo6.tmpdir, 'Binaries', 'SU24').
This will open the folder where the active binary of LibFredo6, with the name: bin_body_Lib6G6.so. Can you tell me the date of the file.
Then, close Sketchup, and try to delete this file.
Then restart Sketchup (the file will be recreated).