I just came across the incident, that I could not filter the green labeled images.
Green is in my labeling system the recommended label.
I could filter the images labeled red, but not the ones labeled in green. Tried it several times. For the delivery of the images I had to relabel all green labels red, and jot down the image number to remember which they were.
Then another thing I am not sure about: has anybody ever lost a label from an image? I had the impression that red labels disappeared in two cases, but it could have also been pilot error.