Is your ~/.spring/LuaUI/Widgets or (for Windows) %spring%\LuaUI\Widgets folder emty or did you add some custom things into these folders?
* Some custom widgets can break the ones Zero-K has in the mod-package and can be disabled with ingame->F11.
Does spring/infolog.txt contain any errors? (You can use an Editor and simply search for "Error" either form the beginning or the end of your file).
If you don't understand your infolog, you can use
http://pastebin.com to upload the content and post us the link here so we see what your Spring does not like on your widgets.
