When I try to select a new Gadget on my perference page, after saving the new Gadget is unselected.
To test you can use the Gadget <gadget-SemanticTemplatesNewToolbar> on de.wikiversity. I have test it with two accounts.
Version: unspecified
Severity: enhancement
URL: http://de.wikiversity.org/wiki/Spezial:Einstellungen