Comment 49 for bug 1292290

(In reply to comment #1)
> Humm, works just fine here.
>
> "Super" is a bit special with some keyboard mappings and is reported as both a
> modifier and a regular key, I guess this is the source of your problem.
>
> I don't think it's a bug in xfwm4 (as I said, works just fine here, Fedora 13)

Strange.
I've got the "super" key mapped to other shortcut, (super v for vertical maximize e.g. ) : it works fine.
If I use this working hortcut for maximise : this one does not work.

That's why I'd say it points to "maximize" issue.

Next time I login, I'll try Alt instead of Super, I'm pretty sure I already did that but I prefer try again.