Have a working link to share? Drop it in the comments (no dead URLs, please).
Simply put: A screenpack that works at this resolution ensures all your characters, stages, and fonts display correctly. mugen 11 screenpack 640x480 work
Planned next steps
To ensure your screenpack works correctly at this resolution, you'll need to adjust the core configuration: Navigate to your M.U.G.E.N data folder : Locate the Edit Game Resolution Have a working link to share