I don't know why but LR CC started to freeze each time I try to enter in the development module.
As a first approach I tried to uncheck the option allowing the use of the graphic card CPU which is my case an old AMD Radeon HD 5570 but with an updated driver dated 2015.
But when I try to do that in the preferences, as soon as I unchek the option, LR freeze.
I have tried then to disable this option setting the useAutoBahn to false as indicated in the support. But nothing changed ans I have some doubt since this wording of useAutoBahn as nothing to do.
I will buy a new graphic card but I would like to use LR until I receive it.
Thanks for your help.
After you did change the useAutoBahn, and then open the preference settings in LR, was it unchecked?
No it was still cheked!
Then it was not really deactivated. It needs to be unchecked after you have turned it off the manual way.