It seems Apple have surprised us (again) with iOS 7 Beta 6. Given the very small size of the update, it appears to be simply a bug fix for iTunes in the Cloud.
As such, it should really have been named iOS 7 Beta 5.1
I've decided to keep using this thread until Beta 7 is out - unless we suddenly see a glut of new app failures under "Beta 6".
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"This update addresses an issue with iTunes in the Cloud, where some purchases may download or play unexpected items. If you have any devices running previous versions of iOS 7 beta, you must:
1. Install iOS 7 beta 6
2. Install the ResetMusicAndVideosLibraries configuration profile
3. From Settings > Music, tap the Reset Media Library button
4. Restart the device"