1° Plus d'imagettes dans la bibliothèque mais histogramme dans partie droite et photos existantes dans le traitement mais sans les imagette de du dessous.
2° quand je charge des photo dans le diaporamma elle apparaisse dans les teinte verte !
Grey thumbnails are usually caused by a defective monitor profile.
As troubleshooting, and as a possible temporary fix, try setting the monitor profile to sRGB (use Adobe RGB if you have a wide gamut monitor).
If this fixes the issue, you should ideally calibrate the monitor with a hardware calibrator. This will also create and install a custom monitor profile, which will be more accurate than sRGB or Adobe RGB.
With LrC closed, press the Windows key + R, type colorcpl in the box and press Enter.
Add the sRGB profile, then set it as default.
If changing the monitor profile doesn't help, try disabling the GPU (set it to Off) in Preferences > Performance.
If this fixes the issue, make sure that your GPU driver is up to date.
If you need help with this, please go to Help > System info, click the Copy button, and paste in a new reply here.
This is not an LrC bug, so a moderator will move this thread to Discussions.
Also, please do not attach screenshots, use the Insert Photos button in the toolbar to embed them in your posts.