Hi, I'm having the same issue, I'd just like to add some facts from my perspective. Both Halfbrick games were working OK, I was playing them already on Consumer preview of Win8 if I remember right. Then I upgraded my laptop to full Win8 and I'm sure I played Jetpack joyride and it was OK, then from some moment I couldn't make it run anymore, don't know what happened. After some time I bought myself the Surface RT and guess what was the only app that kept on crashing right after start, yup, Jetpack Joyride. I tried reinstalling, deleting from account info on the web and nothing helped, then I tried to create local account and in the store I signed with my original Microsoft Account so I could download apps, I downloaded Jetpack Joyride and it worked just fine, even synced my progress and achievements. But the moment I switch to Microsoft account it keeps crashing again. Any ideas?