My photos become black when i go to the develope mode

Hi Hermes,

Could you please uncheck the option for " Use Graphics Processor " from the Performance Tab of the Preferences.

Also please check your Monitor Profile , please follow the link : http://www.lightroomqueen.com/articles-page/how-do-i-change-my-monitor-profile-to-check-wh ether-its-corrupted/

Regards,

Tanuj

Further to Taunt's suggestions, try this:

On one of the photos, go to the Develop module and press the Reset button.  Does that help?

If not, hold down the Shift key and press the Reset (Adobe) button.  Does that help? 

Depending on which one helps, it gives us a clue where to start looking.

If neither helps, we need to know your operating system, general system specs and a screenshot of what you can see might help too.