Read original post at Diary of a Software Mercenary
I followed the advice on msdn about how to add a buy now button to my Windows phone app.
Today, I noticed I had a crash in one of our applications, and downloaded the stack trace.
On the stack is MarketplaceDetailTask.Show
A bit of searching and trial and error shows that if the user executes this quickly (by double tapping the button the handler is on) the program will crash.