Problem with material after reopening a file

[tanya_pehlivanova_77]

I have a problem - after I close a file and the reopen it, all the materials get a strange shade, even though everything looks fine. Even on rendering they look as if they have some shade to them. Can anyone help me and tell me if I can fix it? I use corona render. I am attaching a render with material before closing the file and then after 

[Anonymous]

Hello,

1. Is the rendering engine active?

2. Check your lights.

3. Check your exposure settings.

4. Check the gamma setting.

5. Reset your rendering settings.

Enjoy your work.