Music for alarm sound on stock Clock broken?

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http://forum.xda-developers.com – Weird problem here; when I first got my HTC One X the alarms in the stock Clock app worked perfectly. They still work now, but I can no longer create new alarms with the Alarm Sound option set to Music, nor can I change existing alarms to use new music. I first experienced the problem at least a month ago, and wrote it off to the app data being slightly corrupted, but just a couple of days ago I applied the RUU update, wiping my app data in the process. (And I didn't restore a backup, just reinstalled a few key apps and reloaded their data manually.) So... there are no alarms set in the (HowTos)