I just wanted to report that the software update now available on the BMW web now allows me to play all the m4a files on the USB stick when used in the armrest.

These same m4a files still are not read when the USB stick is used in the glovebox. In addition, there are still at least two of these files burned to a cd that will not play correctly.

On the other hand, everything plays fine when my iP4S is connected through the BMW apps.

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2015 X5 5.0i
2008 X5 4.8i
2012 X5 5.0i retired
2004 X5 4.4i retired