send me to mail firstname.lastname@example.org screenshot of app and describe me please problem. I will contact you for next question that help me for resolve our problem ;) thanks, W.
I think that the problem was that i had your Experimental SDK installed & the WP7 (normal) SDK 7.1 installed too.
Maybe they were in conflict.
Now i have "Connected" on the statut bar of wAppStore & i'm able to install xap on my HD2 :]