Scan 'waiting' after changing tapes in order to continue with a full backup

I'm having trouple with completing a full backup because of changing
Symantec Backup Exec 2012 is connected to a HP tapestreamer with 8 tapes.

1. Backup Exec 2012 is doing a full backup of a network server. This does not fit on 8 tapes
2. I'm changing the tapes to new ones in order to complete te backup
3. A scan is required in order to let Backup Exec see the new bar codes
4. The scan keeps on 'waiting'  as no idle devices are ready

Anyone having the same issues? Backup Exec 2010 didn't had any trouble. Anyone knows a workaround for this?
 

https://www-secure.symantec.com/connect/issues/library-scan-operation-waits-ready-no-idle-devices-are-available
http://www.symantec.com/business/support/index?page=content&id=TECH192576