I confirm, it's a language issue. I had MS3 in French and tried to install this w/o success. The "pro" items were listed in the widget list, but when adding them ... nothing displayed onto the lifestyle"
I then change MS3 to English ... and everything's working like a charm
But you're lucky, I'm unlucky!
Still nothing appears on my Omnia, except for few "pro" widgets but the rare to be displayed are... not the pro but the lifestyle one!
(Same result neither using the French or the English language...).
(J'aurais pu te dire ça en Français, mais c'est pour rester poli !).