When creating a smart playlist for values between two points (e.g. year greater than 1949 and year less than 1960 in order to find all my 50s music) It fails to filter properly.

If I have just the less than, it will give me mostly correct tracks, but will also include those which are not tagged with a year. As soon as I add the other parameter, it then proceeds to include all tracks.

I've tried both Match All and Match Any, but both give the same results.