I am getting a blue background (should be light grey) in develop part and my pictures don't show all other parts are OK
The Forum Lounge is not for technical help, please provide the name of the program you are using so your message may be moved to the correct program forum
Go to Lightroom's Preferences, under Performance, and deselect the option to "use graphics processor."
See here for more detail: Adobe Lightroom GPU Troubleshooting and FAQ
Note that it's possible that updating your graphics driver can help. The FAQ has additional troubleshooting information.
thank you Mike. The problem solved