So, I just got the new U2 CD and was shocked that MC didn't find it in YADB. It is somewhat possible that because I bought it here in Japan the tracks are slightly different and therefore didn't match, but there was a special Japan version with a bonus track that I did not get, so I assume this is the same as the US version. The track order is certainly the same as that on the US version.
At the same time I got last year's Enya CD ("And Winter Came..."), and it too wasn't found in YADB. I retried looking up the tracks and 2 or 3 of them were found correctly, along with a couple others matching an entirely different CD.
So, a few things...
First, I'm wondering why YADB couldn't find U2, which I have to assume is in the database.
Second, when I got a couple of the Enya tracks to match I started wishing that there was a way to select that track and tell MC to load the YADB info for the other tracks on the CD assuming they're all from the CD. Consider this a feature request.
Similarly, it would be nice if there was a way to explicitly query YADB and say, "look up the U2 'No Line On The Horizon' CD and use it to fill in track info".