Users have been finding that updated apps are crashing on launch. The fault is on Apple's end, and it's released a fix.
The problem laid with the corruption of a binary package when distributed to the iTunes and Mac app stores.
According to TechCrunch, Apple has responded to the issue in its developer forums in a short post by user iTunesConnect.
We are aware of the issue related to apps crashing after update. We are currently working on resolving the issue. Stay tuned for updates.
In an email to developers, Apple added:
If a customer reports receiving an error when downloading your app from the App Store, he or she can receive direct help from the iTunes Store customer support team.
If the iTunes Store customer support team determines that the issue lies with your app and not with the App Store or the customer's account, Apple will contact you to resolve this issue.
Please let us know if you need additional assistance regarding your app.
The bug was flagged by Instapaper creator Marco Arment, who noted that after his app's update was pushed live on 3 July, he was deluged with customer complaints about his app crashing. His blog post includes a list of known apps that the issue is affecting.
At 10.30AM, Sydney-time, Apple contacted AllThingsDigital with news of a fix.
"We had a temporary issue that began yesterday with a server that generated DRM code for some apps being downloaded," Apple told AllThingsD. "The issue has been rectified and we don't expect it to occur again."
If you were experiencing app crashes, you should be able to now redownload your app from the App Store without problem.
Edit: Updated 11.38AM GMT+10 to include details of Apple's fix