Hello,
When copying the link from the green “CODE” button on github, make sure you have ‘HTTPS’ selected and not ‘GitHub CLI’ or ‘SSH’. Also make sure that the folders and files in your repository are properly structured as an Ibex project, with your files in their respective *_includes folders. Like this, for example.
You project with 100x50px image files works well for me too. Do you have a link to a project with bigger resolution images that doesn’t work, so I can try to identify the problem?
Jeremy