Camera orientation changes

While testing different type of material exports there was a default Lambert export and Blinn export. Both were exported in the beginning correctly.

I did a minor rotation on the plane obj in Blinn presentation and saved the presentation.

After this the Blinn camera went black.

Checking the issue and it was caused by camera pointing upwards.

Checked camera from another test presentation and they both had the same pos,rot,scale values but in other one the camera pointed upwards when it should point downwards.

To me it seems that the world rotation has flipped or something.