Custom ringtone not working on Nexus 5 since OTA Lollipop

I've updated my non-rooted, vanilla Nexus 5 with an OTA update to Android 5.0 Lollipop and since then my custom mp3 ringtone stopped working. Here are the symptoms:

1. When selecting it via the ringtone selector in the Sound & notification settings panel, it plays properly.


2. When someone else calls me, the default system notification sound is played repeatedly.


3. Re-uploading the custom ringtone via AirDroid as an .mp3 file didn't work, nor did uploading an ffmpeg-encoded .ogg version of it.



4. The same applies to my custom notification sound.

I'm currently using one of the ringtones bundled with the system, and I'd love some help in solving this problem. Thanks!

Answer

A friend suggested clearing cached data (via Settings > Storage > Cached data) and then rebooting, and it seems to have resolved the issue.