Symantec OstDrv devices using up LEO licences

Hi,

I've just installed BE2014 - CASO + MMS - and configured a dedupe store on the MMS. 

For some reason the dedupe devices are showing up as 10x Tape drives with a Product id "OstDrv" and Firmware "CAGM" and they're using up the LEO licences installed on the MMS.

There is actually a tape library with 4 drives (two disabled/offline) connected to the MMS

Any ideas on why they're showing up?  BE2012 didn't show them.  I've checked the registry for the HKLM\Software\Backup Exec For Windows\Backup Exec\User Interface\ShowHiddenMedia key but it's not present.

Cheers, David