Collections displaying in preview, not live

Greetings,

Several of my collections are not displaying correctly in devices with iOS6 installed or on the newest iTunes. If view the preview, things are fine. If I view on a pre-ios6 device, things are also fine. But if I view on iTunes desktop or on a device with iOS6, the collection appears completely empty.

I have refreshed the feed twice to no avail.

Other feeds are just missing the most recent content (same device issues as listed above), but my primary concern is those that simply contain nothing.

Anyone have a fix?