I'm on windows 10 1511 build. I've started encrypting an external HDD with bitlocker with the new XTS-AES encryption and later realized this is going to cause problems for my recovery system (macrium reflect) which cannot handle the new encryption yet. I've unencrypted the HDD which went fine. The manage-bde status is like this:
Volume I: [bigmirror]
Size: 1863.01 GB
BitLocker Version: None
Conversion Status: Fully Decrypted
Percentage Encrypted: 0.0%
Encryption Method: None
Protection Status: Protection Off
Lock Status: Unlocked
Identification Field: None
Automatic Unlock: Disabled
Key Protectors: None Found
However when I try to encrypt it again I get the Parameter is incorrect error. An error occurred (code 0x80070057). I've tried googleing and while there's a lot written about this but nothing that could help me so far.
I've tried rebooting, unlocking it again (it says it's already unlocked). Encrypting other drives works ok.