In my experience auto mounting with PC-BSD has always been very hit & miss; and PC-BSD 7.0 doesn't seem to be helping.
Manually, you should be able to mount it with the command:
$ mount_msdosfs /dev/daNsM ~/your/mount/point
where /dev/daNsM is the device, you can look in the /dev folder to find it; if you are lazy like me, use the 'ls /dev/da*' command in konsole to get a list. Probably it will be /dev/da0s1. And where ~/your/mount/point being where you want it mounted. I posted an updated mount_auto script in the Tips & Tricks forum; but it doesn't handle device detection, only file system.
If the system can't automount it, but can get it mounted manually -> you can always rig the system to attempt to mount the media player whenever you double click an icon.