BESR 8.5 and Win 7 Ultimate Bitlocker

I have recently install BESR 8.5 on Win 7 Ultimate. The machine is a laptop and has bitlocker enabled. I keep getting the following errors whenever I attempt a backup:

EC8F17B7: Cannot create recovery points

EC8F03EA: Cannot create a virtual volume image of the selected drive.

E0BB0147: the operation 'Snap Volume' is not currently enabled for this Volume.

Error E0BB0147: The operation '%1' is not currently enabled for this %2.

I have run FIXINSTALL.BAT and rebooted, no effect

I have uninstalled, rebooted and reinstalled, rebooted, no effect

I have manually installed and registered the SymSnap service, made sure it's started, no effect.

I have other machines running bitlocker that are backing up fine.

Any ideas?