A number of iOS apps that posted updates in the App Store in the last couple of days are crashing upon launch. The issue appears to be affecting many apps, including popular ones such as Instapaper and Angry Birds Space.
The first official word about the problem appears to be from Instapaper creator Marco Arment. In a blog post he explains that after the latest Instapaper update went live on the evening of July 3, many users were complaining the app was crashing immediately upon launch, regardless of whether the user had merely updated the app, or started from scratch.

Arment soon found the problem wasn’t just with his app. Other developers and their users have been experiencing the same problem, including GoodReader for iPad and the free version of the popular game Angry Birds Space. Arment includes a list of the known corrupted apps in his post, all of which posted updates July 3-4.