Nah Alan, it's not rare. (I only just saw this post)
In the past when I encountered this, I always went the uninstall ATI catalyst manager+drivers
through add/remove programs first and then followed it up with a safe mode clean using driver
Download and install Driver Sweeper
With both cards in place+bridge attached
► Create a restore Point
► Uninstall Catalyst manager via add/remove programs (should remove CCC and drivers etc)
► reboot into safe mode
► Anaylse/clean ATI drivers and files with Driver Sweeper.
► Reboot into normal mode and install the driverset you want to use. (Use custom install to leave out stuff you don't want installed if you wish)
► Reboot (Optional)
CCC should be operational and CF enabled automatically. If not, manually enable CF through CCC.
Some times it's best to 'start from scratch' when adding a second card. Particularly when it comes to CCC.