"Destination Folder Access Denied" [Windows 10 Pro x64.] I can't move files on my external hdd.

This probably became a problem after I installed windows 10. (Used to have 8.1 pro)

The hdd is encrypted with bitlocker, but that shouldn't matter right? I can read from the disk without problems.

Here's an album to describe my problem.

I'm trying to move a folder on the external hdd to another folder on the hdd. In other words, I'm moving folder "A" to folder "B". That doesn't work. But when I tried to move folder "A" to folder "C" on the same disk, that worked. And after moving it to folder "C" I also got access to remove the "read only". (Which I couldn't do when it was in it's original folder.) But I still need to move it to folder "B", and that still gives me the same error messages.

I did try to change the permissions for the whole disk, and doing that I got no errors, but still I can't move the files where I want. I also couldn't change all the permissions. I tried to give all the "groups/user names" full control, but that didn't work.

Any ideas?