I have LR 5.7 installed and is working fine. I downloaded LR cc yesterday but the dev module is locked. I have signed out and signed back in a dozen times.
I have PS cc which is running ok. Not a chance of getting help through Adobe, thats a joke.
Any advice would be most welcome.
If by locked, you mean there's a box with an X in it where the dev module is supposed to be.. either upgrade your video drivers, or disable GPU acceleration.