Bringing over a .tox file from a 2023 project I noticed most of my TOP OP viewers are empty. They actually output pixels and when I add a new operator they show the pixels.
Have you tried hitting ‘h’ when the viewer is active to re-home it? There was a bug where viewer settings were getting corrupted when projects were moved back and forth between 2025 and 2023 that would leave the viewers in a broken state.
Glad it’s working. There was supposed to be a patch in the recent official release (2025.31550) that would automatically reset the viewers if it detected this, but maybe its not catching your case for some reason.