I have noticed in Mendix 5.12.0 that it seems to fail to generate thumbnails if the image being uploaded is a small size, resulting in a broken image icon being displayed in an image viewer with display set to thumbnail. Has anyone else encountered this issue?
A good workaround for now is to choose picture instead and give the picture the same dimensions as your thumbnail would have had
Sebastiaan van der Plaat
Yes, we encountered exactly the same. I think we should file bug reports.